I’m currently cutting scrap cardboard while I’m learning the basics of how my laser engraver operates. During our last freez-apocalypse, we had a pipe burst in the attic. The shutoff valve box at the street was full of frozen mud and I couldn’t dig the valve handle out. Fortunately, there is a cutoff inside the house, it just needed a little labeling for easy location in the future:
Pretty simple construction here- two layers of cardboard. The letters were cut from white cardboard and attached to the tag with a few dabs of super glue.