If you have an old NES or Sega controller lying around, this could be a fun project to revive it: using it as and you're looking for a fun project to bring it back to life, consider adding an mp3 player like retro gaming forum System 11 user burgerkingdiamond (BKD) did.
On retro gaming forum System 11, burgerkingdiamond (BKD) details how he converted his old controllers. First he applied retr0bright to restore the yellowed plastic, then opened the controller to incorporate a cheap Coby MP3 player he scored from eBay. He added the headphone jack in the hole for the controller cord, added the USB port from the player, cut a hole in the controller for the MP3 player display, and wired the controller buttons to control everything.
For more details see the step-by-step photos at the source link below.
Have you ever repurposed a video game controller? Tell us about it in the comments?