I don't swap much anymore. For several years I was perpetually in block swaps. Loved the heck out of 'em, too. But after a while I realized I wasn't getting the creative outlet I wanted, so I stopped. Once in a great while I'll still join one. Right now I'm participating in the Candlemat Swap on Quilting Gallery. The block pattern looked interesting and versatile. I made this test block in traditional christmas colors just to make sure I really wanted in, then I joined up.
Our swap partners are blind - that is, we don't know who has our name, but we get someone's name and color/style preferences.
One of the things I enjoy about swapping is trying to work with someone else's color preferences. You're pretty much guaranteed that it'll be different than your own, but that's a good thing to me.
Here's a shot of some of the colors going into my partner's mat. Now I just have to quit being such a chicken and turn them into something!