Efficient Computer, What Should I Do with It?

I recently bought a case for a small board I had left over from early ASIC Bitcoin mining. It draws less than 5 watts. It's a single core 1.8GHZ with 2 threads, 2 GB ram, and 32 GB drive. I switched the os from windows vista to linux distro.

What are some fun projects I could do with it? I'm wanting cheap projects with one main task.

First thoughts were to create a donation website that could (maybe) pay for it's own internet. However, a cloud machine would probably out last this physical box.

Second thought was a digital panhandler. So once someone connected to it's open wifi, it would try to entertain them from content submitted by previous strangers. No internet cost with this one, maybe kinda boring though.

Please give me some ideas.