I decided to use wool, and to make each of them into a little piece of art. Each one is unique in size and color. I only used the same yarn on 2 of them. The pattern, of course, is Pretty Petals Potholder.
You can see closeups of all 5 potholders here in my Flickr set.
Thank you so much to Adrian and Maritza for organizing this swap. I usually knit, and crochet is very new to me. This swap reminded me of when I was a new knitter and every little knitted bit was very exciting. I was so happy to feel that way about crochet, because I was never really "into" it before. I can't wait to see the potholder collection that will come to me.