Created this basic hook to hang up some kitchen stuff, print it for less than 20 grams. 
Should be scalable so if you need something smaller/bigger you can scale it up/down without issue.

The back is a 50mm x 50mm base perfect for a large command strip to hang it up without needing screws.
Note if you plan to hang significant weight from this hook you should modify print orientation for better strength, for my needs I didn't need to hang more than 10lbs.
  
I printed with PLA because the load I have on it is lighter, if you need to hang something heavier I would recommend printing out of PETG or ABS.