[mkosmul]

Designing origami tessellations: https://origami.kosmulski.org/albums/tessellation-examples

It's lots of fun, with folding allowing you to go offline for a while. The community is very friendly, both online and with IRL meetings such as yearly conventions in many countries.

Still a kind of niche within origami, so there's lots of room for novelty and explorations. And there are strong ties to mathematical and computational origami if you're into this kind of thing.