What cool contests! I am SO digging this swap.
This might be kind of obvious to everyone - being a vegan yarn swap and all - but I list it for my contest entry anyway:
Vegan Yarns on earthfriendlyyarns.com
Yarns from nettle fibers? Banana silk? Cool!
I've used the Knit One, Crochet Too Recycled Cotton yarn to make a sweater for my son and really, really liked it. It's all recycled from the textile industry...neat.