I dug through all of my desk drawers and found: push pins, erasers, and paper clips. These are the letters I made, and submitted.
I was very excited when the issue arrived! These were my favorite letter forms:
"confidential" made up using a confidential stamp. Genius.
Vintage postage stamps.
Cut rubber bands.
hole punched paper and push pins.
Here's my submissions printed in issue 19.
The rest of the issue is great too. They always find the most interesting subjects to include.
You can find Uppercase here.