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 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.

Amstrad CPC
Apple 2
Atari 2600
Atari 5200
Atari 7800
Atari Jaguar
Atari Lynx
Colecovision
Commodore 64
Gameandwatch
Gamegear
Game Boy
Game Boy Color
Game Boy Advance
Genesis/Mega Drive
Intelivision
Mame
Master System/Mark III
Mega CD/Sega CD
Neo Geo
Neo Geo Pocket
Neo Geo Pocket Color
NES
Nintendo 64
Pokemon mini
PSP
PSX
Retropie options
ScummVM
Sega32x
Snes
Wonderswan
Wonderswan Color
ZX Spectrum

https://github.com/winnetouch/lores-retropie-theme