Put them in a drawer and forget about them like everyone else.

https://preview.redd.it/t0ktrv7cevwb1.jpeg?width=3024&format=pjpg&auto=webp&s=2165f6b02b95cc0c6d62fd467673503cba70424c

I use my old iPhone 4S as iPod, I have it docked and I listen to music on my sound bar in my living room. I can use the Apple TV control for skip songs or adjust volume. Also I have an old iPod touch 4G which has a lot of games like Resident Evil 4 and Dead Space