Use your computer's waste heat to grow plants: https://inhabitat.com/this-desktop-computer-grows-plants-inside-of-it-while-computing/

Cool idea imho if you have a desktop pc but obviously might work for other heat producing devices too, thinking of wifi routers or tvs for example. No need for a fancy acryl case like in the article but similar effects might be achievable with less tech.

Found in the latest article in the blog of @scribe which I recommend in general:

https://beamspun.exmosis.net/2020/06/beamspun-9-14th-june-2020.html