I now have a pack of themes posted at
EP Forums. Below are a few of them, all based on firmware v0.1.7e

SNES Cart: EU/JP colors with controller (no controller version available)

SNES Cart: US Lavender with controller (no controller version available)

Super Famicom Clouds Cart

Super Famicom Cart - No Clouds

EverDrive Style

Mario Night

Super Metroid

Prehistoric EVO

RetroRGB Tribute

Treasure

Zelda - Super Famicom

Zelda - US Super Nintendo