Sure! Everyone picks an element to do, for instance borders, frames, tags, etc.... Then you make the same element for all the people in the swap (usually around 20).
When you are done you send it to the host (me!) and then when I get everyone's, I will give everyone one of everything.
So basically you make 20 of the same thing, and get back 20 different things! For the park swaps we did, most people picked 2 elements, so you may have, lets say, squares from the first group and borders from the second and you do them to coordinate your theme, so everyone had 2 coordinating elements to use on a page. You could do a search on swaps and see what it's all about. Someone even posted pictures of the great elements everyone made!
I hope that makes sense!
Franne