Perhaps everyone else on the web already knows about this, but I found a fun little game to play with one's signature in forums. It's at http://dragcave.net
. Privacy terms look ok (though if someone has info about this, please post!) One registers, then starts adopting eggs. Adopting an egg generates a block to insert into your signature in online forums or other places people might view an image. After the eggs have been viewed uniquely a certain number of times, they hatch, and the dragons start to mature-- this is also displayed in the signature. I'm just trying it with one as an experiment. Hatching and maturation can apparently also be hastened along with unique clicks on the egg/dragon. Once one has a few adult dragons, they may breed and produce more eggs. It's kind of an amusing way of graphing online activity (across multiple sites, even).
I thought it was somewhat clever and rather cute.