I did a series of these a while back and they were really fun but I didn’t develop them myself, I purchased them off of Etsy. I tried a bunch of different different ways to color them and you might find that interesting:
One thing that I did that I thought was a nice addition was to incorporate keyhole hangers into my first two layers. This allows it to hang flush against a wall. If you’ve never seen any post about keyhole hangers here’s a link:
You can modify this design or make your own version but putting those shapes in the bottom two layers will really make it far simpler and cleaner to figure out how to hang these if that’s your goal.