A Sega Genesis controller painted like a NES controller? You painted a Sega Genesis controller like a NES controller? YOU HAD THE BALLS OF PAINTING A SEGA GENESIS CONTROLLER LIKE A NINTENDO ENTERTAINMENT SYSTEM CONTROLLER??
NOOO!! NOOO!!! THAT DOES NOT COMPUTE!! THAT DOES NOT COMPUTE!! THAT DOES NOT COMPUTE!! RAPE MY CHILDHOOD, WOULD YOU!?
I believe the closest you can get is the Hyperkin Retron. Specifically, the version that plays NES, SNES, and Genesis games. On that, you can plug in a standard Genesis controller (instead of the ones it comes with) which will work with SNES and NES games. Of course, the two buttons that work are "B" and "C". Also, where's the select?