There are already companies that do this. Here's one of 'em:-
http://www.forat.com/service/all%20pictures.htm
Most are, er, grotesque, imho. And most are Akai samplers, but there's a few keyboards in there too.
Korg Triton ^^^ .
Eugh.
Lol, the customised AKAI user pics are actually quite funny. No dissin' da funky-ass beat rappaz 'n der biyatches, blood bro' mutha, innit y'all.
[/does a funky fing wid 'is fingaz 'n bling]