A friend of mine who makes calligraphic buttons is looking for slogans (funny, punny, insightful or with in-jokes) about knitting. I can't promise anything but her appreciation and the knowledge that people will be wearing them pinned to their clothing at conventions, but that's cool all by itself.
I drew a complete blank (other than the one I had made, which says, "Step away from the qiviut and no one gets hurt"), but I told her I'd ask here.
You can find a link to her email on the front page of that website, or you can post suggestions here and I'll send them to her. Or just post them here for fun, because they could make cool icons.