Cannot upload mugs and sprites?

[zupakid]

is there a way to add to the currently-usable sprite bank? What I mean is, is it possible to have some spriters donate their mugshots etc. and have Siro, or whomever else could do that, put into the 'default' options that are already available? It's a temporary (and messy, if too many people jump on) solution, if it's even possible... but it could provide a little more sprite diversity?