I don't know if people on this place are interested in something like this, but I might just as well post it here just in case. I've written a program which creates sounds that are, imo, pretty un-Gameboyish. It tries to emulate a resonant filter of sorts. Even if you're not into making music with Gameboys, someone might find it fun to play around with this thing for a bit.
http://blog.gg8.se/wordpress/2012/12/11 ... synth-rom/
http://blog.gg8.se/wordpress/2012/12/11 ... synth-rom/