@granderjoree Looking at the Carbon theme, I think it's enough to create another folder with the collection name, with the same structure as a system folder.- For instance, copy the snes folder from the theme folder to your collection name folder (i.e. megaman), then modify the art (.svg) files inside the art subfolder with the images you want.

SOLVED! I forgot to copy the gameslist.xml into the folder! Haha silly me. It now works fine. Thanks guys!