I plan to wear the Mr. Herriman button when I have to moderate something, the Bloo button when I feel like being a brat, and the Frankie button... actually, I'm not planning on taking that one off.
There's another set available right now:
http://cgi.ebay.com/9-Fosters-Home-f...QQcmdZViewItem
They come and go in clusters, I think; there's often a number of sets available in the span of a couple weeks, then nothing for some time.