For now I set up the ground work (layout) and decided to omit quite a few functions to make the theme usable on 320x240 screens (like just the game list and thumbnail in detailed view).
At this point I'm focusing on making as much pixel art as I can before the holidays . I'm almost done with all the handheld systems (+ a couple of retro consoles), but I'm hoping to eventually cover most of the systems the PI can properly emulate.
I haven't started working on the system logos yet. For now I just lifted them from the Pixel theme.
EDIT: If the author of the original theme objects I'll make changes to the theme to differentiate it from his.
Game Boy Color
Game Boy Advance
Master System/Mark III
Mega CD/Sega CD
Neo Geo Pocket
Neo Geo Pocket Color