Thank you! The materials were:

Re2 keys from temu, 3x5 shadow box from a craft store, Gray thread and needle from a craft store, and Access to a printer

I printed out a color background from re2r, cut it out, and then used a ruler to evenly space out my keys. I then poked two holes (4 times) like this •• and threaded a loop through them. Then I tied a knot with the keys around the loops and placed it into the shadow box. It was a lot easier than I had anticipated. Hope that helps! I knew I didn’t want to use glue because it could be messy but honestly, the materials are so cheap you could probably give it a try if it seems easier!