I guess I'm on a bit of a red kick!

I read on Polyvore's FAQ that their software is designed to display all sets as squares & that if your sets are some other shape, they will be resized to fit within that square. So, for fun, & as a challenge to myself, I thought I'd try making my sets square. This is *not* easy for me as my default shape is rectangular. This won't be permanent (it's too hard for me!) but I am having fun changing things up a bit. It does make me wonder, though - how do all the people whose sets are perfectly square do it? Are there some sort of guides to the magic square that I don't know about? =D