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