heya!
ever heard about signature rotation?
no?
you can use several signature pictures and everytime someone requests your signature pic it will randomly display one of your (several) pictures... sounds more complicated than it is!
i looked around google but couldnt find anything cool... this site seems to offer siganture rotation but i didnt try it out because you have to register
http://www.avasig.com/
oh yeh... i like the sig with the smoke in the bowl better =)