Round 3: Battle of the Best Sets Ideas

Battle of the Best Sets contest ideas! I don't want to hand this group over to someone who wont do anything with it so I'm not judging the set, I'm judging the ideas. Put a list of 15 contest ideas in your set description or a comment.
Ex: Animals, Music, ext.
NO IDEAS THAT I'VE ALREADY USED!

Created by livelaughlovexoxo. Created in Battle of the Best Sets. Two sets from two members. Ended 7 months ago.