Twibbon is a service that allows you to overlay a cause’s badge over your Twitter icon.
I created a Twibbon overlay for Approve71.org.
The results look great on Twitter and Twibbon.
Unfortunately, if I save the image and upload it to Facebook as my profile picture, it doesn’t look so good. Even if I use the FB UI to pan around in the image, the cropping ruins it.
I just mailed stormideas, the people behind Twibbon, asking if they could do something similar for Facebook profiles.