These buttons by Bang Bang You're Thread are a must for every vegetarian. The set of three feature a tree, i *heart* tofu and plant eater. They come with a free information card illustrated by Allison Cole called '5 reasons to go vegetarian' (only 5?!). The buttons measure 1" each and the set costs US$4.
Related: First blood for first vegetarian minister? | Manna Restaurant serves up delicious vegetarian grub
Wow! I love these. May just have to order a few for myself and some veggie friends...