Since it's a nice day to stay home, I'm playing around with the expanding foam stuff. Great fun! I have sprayed vertical lines up and down a long piece of aluminum foil and created some knotholes and a shelf or two trying to make a natural tree trunk look. I can see I will have to do some carving. More fun! And then the best part, painting. I have only lime green non-toxic paint handy but that's no problem to get other colors. I am hoping the hardened foam peels off the foil. If not, no problem. I thought a removable background will give me more options that spraying directly on the glass. I will let y'all know how this works out. Any comments welcome.