Wow, that is an insanely good idea! I really like this, especially those little Game Boy games! You could probably sell these on the Etsy marketplace. For now, I'll just leave my game paks bare, but this seems like one of those most cost effective ways to make your games look cib without paying for a repro or tracking down universal and DS game cases.
This is very crafty and I think the others on the site will love this!
Subbed and liked. Great stuff!