Want to play fashion editor? Piperlime gives you the five big trends for fall. You create as many fabulous sets as you’d like, using at least one of the styles above. Please only use items from Piperlime in your outfit. If celeb-stylist Rachel Zoe chooses your set as one of her five favorites, you’ll win a $250 Piperlime Giftcard. And Piperlime will feature your set on their Facebook page. Pretty cool, right? Want to get tips, trends and exclusive offers from Piperlime delivered straight to your inbox? Get the scoop.

What to Wear to the Beach?Submit your best beach looks! Bikinis, tankinis, monokinis, or any kind of swimwear is fine.12 winners will be chosen by the votes of the Polyvore community and be featured on the Polyvore homepage.

Milan. London. Paris. New York City. Four cities where fashion never sleeps. Channel your innermost fashionista to create looks inspired by one of these fashion capitals. Each set should encompass only one city. 12 winners will be selected by the Polyvore team and featured on the Polyvore homepage. 1st, 2nd and 3rd place winners will also receive $50 American Express Gift Cards. Style away!

Get lost in a kaleidoscope of color with Marc By Marc Jacobs. This season, weave vibrant jewel tones and plaid patterns of the 70's and 80's together for the ultimate street style look! Marc by Marc Jacobs also invites you to let the musical magic of Brooklyn-based electronic pop trio Chairlift further inspire your style. Marc by Marc Jacobs has partnered with Saks.com and Chairlift to show how seamlessly style and music merge together. You may remember Chairlift’s popular song “Bruises” that was featured in the 2008 iPod Nano commercial. Well, Marc by Marc Jacobs has outfitted Chairflift's band members in some of their favorite fall looks and hit the studio with them to witness fashion and music in action. Watch the Marc by Marc Jacobs and Chairlift video here and on Saks.com. And while you’re on Saks.com, don’t forget to clip your favorite fall pieces. Create your favorite Marc by Marc Jacobs fall look using at least two Marc items. We encourage you to feature Chairlift as characters in your set as well! 6 winning sets will be chosen by style experts at Marc By Marc Jacobs. - The 1st place winner will get a $1000 shopping spree from the fall collection. - The 2nd place winner will receive a Marc By Marc Jacobs handbag. - 3rd, 4th, 5th and 6th place winners will receive a grab bag full of Marc goodies. All 6 winners will also receive a copy of Charlift's latest album "Does You Inspire You".

Gossip Girl -- your one and only source into the scandalous lives of Manhattan's elite... Spotted: The Upper East side's privileged teens unpacking designer suitcases stuffed with shiny new secrets and hidden agendas courtesy of a scandalous summer in the Hamptons. As the second season of the CW's breakout hit Gossip Girl unfolds, nothing is what it seems. We love Gossip Girl for the delicious drama it brings, but we also can't help but obsess over the fabulous fashion in every episode. Gossip Girl brings you the latest from the hottest designers, from Little J's gorgeous Tarina Tarantino accessories to the many beautiful Alice + Olivia dresses worn by Blair and Serena. For more info on the fashion you see on the show, check out the Elite Gossip Girl Style blog, which has a great roundup of who wore what for every episode. Other great sites for the latest dish on Gossip Girl include YouKnowYouLoveMe.org and GossipGirlOnline.net. Create an outfit for the Gossip Girl Style Challenge and win a $100 American Express gift card! Create an outfit inspired by your favorite Gossip Girl character. 12 winners will be chosen by our special guest judge, Kimberly Couzens of the Elite Gossip Girl Style blog. The 1st, 2nd, and 3rd place winners will recieve $100 American Express gift cards to use to buy their outfits! All the winners will be featured on the Polyvore Explore page and blog. Don't forget to tag your set with "Gossip Girl" and the name of the character who inspired your outfit. To submit your entry, click the "Submit a set" link below. New Yorkers can also win 2 tickets to the Gossip Girl Sites Tour in our Lucky Draw! If you're located in or around New York City (or you have plans to visit), you're also eligible to enter our lucky draw for a chance to win 2 tickets to the Gossip Girl Sites Tour. The Gossip Girl Sites Tour is a 3.5 hour tour of over 40 Gossip Girl filming locations in New York City. To enter the lucky draw, just email us a link to your contest entry at gossipgirl@polyvore.com (you must also submit your entry below). We'll randomly select a New York winner to receive the tickets. So, which Gossip Girl character's style do you love most? Who do you identify with? - Serena Van Der Woodsen, the reformed wild child with a free spirit, great hair and lots of glam. - Blair Waldorf, the headband-wearing queen bee of Constance Billard School for Girls, who goes for the preppy, polished, classic look. - Jenny Humphrey, the wannabe fashion designer with the edgy, punk-rock inspired style. - Vanessa Abrams, the home-schooled Brooklynite film geek who loves to mix boho chic with urban street style. And don't forget the boys, who are just as stylish as the girls... - Nate Archibald, the scandalized golden boy with the All-American looks. - Chuck Bass, the metrosexual millionaire playboy who isn't afraid to rock an ascot and tailored suit. - Dan Humphrey, a.k.a. lonely boy, the scruffy, soulful writer who can only afford vintage threads. Tune in to Gossip Girl every Monday night on the CW, or watch the episodes online at CWtv.com.

Piperlime invites you to create spring-forward sets featuring the hottest shoe trends of the season: Wedges and Tribal sandals. Piperlime has found the best wedge and tribal styles this season from great brands like Cynthia Vincent, Matt Bernson, and Frye, and they always offer free shipping and returns. Create a set using either a pair of Wedges OR Tribal sandals from piperlime.com. 5 lucky winners will be handpicked by the Piperlime team to receive Piperlime Gift Cards*: 1st prize: $250 2nd prize: $100 3rd, 4th & 5th prizes: $50 Winners will also be featured on the Explore page and blog. Don't forget to tag your set "Piperlime wedges" and " Piperlime tribal sandals" before publishing! *International winners will receive Amex gift cards in lieu of Piperlime gift cards

Lady Gaga is trying to change the world, one sequin at a time. Lady Gaga is rocking both the music world and the fashion world with her amazing sound and irrepressible sense of style. Her self-styled outfits are wild, theatrical creations that combine rocker chic with disco glam and a splash of burlesque. As V Magazine put it in their recent article on Gaga, “Whether with a lightning bolt painted on her face, big bows in her hair, space-age cat suits, or that Chalayan-inspired bubble dress with matching piano, she can evoke David Bowie, Grace Jones, Björk, Stacey Q, Klaus Nomi, or Suzanne Bartsch." Lady Gaga’s rise to fame Gaga is the girl who at age 4 learned piano by ear. By age 13, she had written her first piano ballad. At 14, she played open mike nights at New York clubs and was teased for her quirky, eccentric style by her high school classmates by day. At age 17, she became was one of 20 kids in the world to get early admission to Tisch School of the Arts at NYU. Now at age 23, Lady Gaga has a platinum album “The Fame” and several hit singles, including “Just Dance” and “Poker Face”. She’s been nominated for 9 MTV Video Music Awards and is embarking on a co-headlining tour with Kanye West in November. Unleash Your Inner Gaga! Create an outfit that draws inspiration from Lady Gaga’s unique sense of style and her I-don’t-care-what-they-think attitude. Lose your inhibitions, get crazy, and get glam! Make sure to include at least one photo of Lady Gaga in your outfit. Seek inspiration from Lady Gaga’s latest music video “Paparazzi”. Lady Gaga will personally choose one very lucky winner to receive an autographed copy of her album and a Lady Gaga merchandise pack containing vinyl, a hoodie, t-shirt, hood wrap and necklace. The winning set will also be featured on LadyGaga.com and on Lady Gaga’s Facebook and MySpace. To keep up with all the latest news and happenings in world of Gaga, visit LadyGaga.com or follow her on Twitter. Sign up for Lady Gaga email updates here.

It's absolutely frightful...there are only 15 days left until Halloween! Do you know what you're wearing? We've been giving you daily Halloween costume suggestions on the Polyvore blog, but now it's your turn to get creative! Let jack-o-lanterns, black cats, haunted houses and all things "spooky" inspire you to put together your best costume for our 2nd annual Halloween contest! 3 winners will be featured on the Polyvore homepage and blog.

Gala Darling, of the supremely lovely iCiNG blog, presents ten hot trends and challenges you to create the most stylish outfits for them! Choose one of these trends: Gladiator Sandals Metallics Purple Blazers Prints Waistcoats Headwear Flared Trousers High Waists 1940s ...and create your set using the items of your choice. Be sure to name your set "How to Wear" and finish it with the name of the trend (so, "How to Wear Gladiator Sandals" or "How to Wear Prints"). Gala will choose the top 12 winners based on how well you style the trend, and each winning set will be featured on the Polyvore homepage as well as on iCiNG! Create your entry now »

Confessions of a Shopaholic invites YOU to step into Rebecca Bloomwood's Manolo Blahnik shoes and raid her virtual closet! Create outfits that embody her colorful style and fun personality. And remember, the word "frugal" is not in Becky's vocabulary! In the glamorous world of New York City, Rebecca Bloomwood (played by Isla Fisher) is a fun-loving girl who is really good at shopping -- a little too good, perhaps! She dreams of working for her favorite fashion magazine, but can't quite get her foot in the door -- until ironically, she snags a job as an advice columnist for a financial magazine published by the same company. To inspire your outfit choices, check out Bluefly.com's Shopaholic page, which has every piece you'd need for a Rebecca Bloomwood look. For more details on the movie, which hits theatres on February 13th, go to the official movie site.