Printing images of famous peoples faces and putting them in mason jara filled with mineral oil is something.
Collecting dirt from places you visit (if legally allowed, like, not state parks) and keeping it sorted and labeled.
Making wreathes out of sticks that fall in your yard and putting flowers from weeds into it and leaving them at random doors in the neighborhood with a note that says “for your protection”
I have houseplants, a fish tank, and i like to cook.
You pick something you enjoy and turn it into a hobby.
Personal rules: NEVER MONETIZE YOUR HOBBY ITS NOT A JOBBY
Years back i made a drop spindle from a wooden dowl i carved by hand to have a simple hook at the top, a stainless steel sink strainer for the weight, and some two part epoxy. It still holds strong to this day. I also built a spinning wheel from wooden toy blocks, a bicycle wheel, and coat hangers. My wife bought me a beautiful spinning wheel a few years later. I need to get it back out and use it.
Wool is nice but if you can get alpaca you’re gonna love it.
My hands hurt too much to effectively knot or crochet anything unfortunately