I made my Grandmother two picture hanging signs for her grand kids and great grand kids. The one for the grand kids, I got a wooden sign , painted it, and added the white letters, and glued the clothes pins to it. The great grand kids sign, I printed out words in a font that I liked and used an x-acto knife to cut the letters out and use it as a stencil. Then I used a pencil to trace the letters out really deep and took a black paint marker and filled in the letters. I used small eye hooks, screwed them in and tied the twine to them and put the clothes pins on the twine.
If you look really close, you can just barely see the engravings.