I am currently participating in a dish towel swap on a facebook page. We are all sending a dish towel to the person that signed up after us on the sign up sheet. I thought it was a grand idea!
Also in a 1 skein mystery swap. After everyone signed up the coordinator emailed everyone with their recipient name and address. I sent my person a message asking a bunch of questions as I had the idea to make her a pair of earrings with crocheted beads but needed to know if her ears were pierced. Thankfully I had about 10 different questions (do you like to wear bracelets, necklaces, are your ears pierced, what is your favorite color and more) because it turned out she is allergic to most earrings so does not wear any. So, I made her a crochet rope bracelet in her favorite color, bright pink.
Some of the other swaps I have seen for future ideas: Earth and Sky Swap (there is an earth and sky by red heart and using turquas and browns), rainbow swap, scrap bonnet (there is a pattern in ravelry called chapeaus afghan at
http://www.ravelry.com/patterns/library/chapeaus-afghan), stained glass (make squares with variegated yarn and add black around when you get them back), halloween (black and orange), holiday (red, green and white), luck of the irish (greens and white), brown cow (all shades of browns, tans), floral garden (all flower squares). I am hosting one on a facebook page that is triangles. I have given participants the pattern and they can do all rows the same color or different and we are using pastels.
Welcome to all the new participants! How many does that take us up to?