I ended up using my own badges from shields.io because the widgets generated for me say "I receive $null from GitTip." And the buttons don't say anything useful: People don't know what "Gittip" is by itself, and "3.00" (actually, for me, they say "NaN") doesn't mean anything either. I made a badge on shields that says "tips|accepted" because I 1) wouldn't want people to know how much I'm making on Gittip and 2) don't care how they donate, really. But I like the idea of Gittip and hope it continues and grows.

I'd love to see actual stories of donors/receivers there, too.