Hardware ideas

Hi! I'll be participating in a hackathon next month in the hardware division. I was thinking of making something sollarpunk inspired. I'm posting this to ask for inspiration.

What is some of technology (esp. hardware) that you'd like to see implemented? What is a problem that you'd want solved that could have a potential hardware solution?

I know this is very vague, but I'm curious if anyone has some ideas to share :)