You don't need to create these yourself. You can find pre-made sets:

The built-in scraper sometimes misses rare games, fan translations, or custom ROM hacks. Downloading complete collection packs on your PC is the most thorough method.

Go to and make sure it points to snes9xgx/covers/ . Set Preview Image to "Covers".

You might skip over a text file named "Plok (USA).smc," but you’ll stop and stare at the colorful, weird cover art of a spiky red character. It encourages you to play games you might otherwise ignore. It turns the act of "selecting a game" into "browsing a collection."