could use that arduino to set up some light rigs that illuminate to the bass of songs. thats one of the options im considering for my dp helmets
i only got to play with a raspberry pi when i was taking coding classes, and i didnt even get to play with them a lot so im not sure what all you can do with that. i know you can use it to make self stabilizing robots tho, so if you're into that kind gadgetry you could tamper with that