I’ve been messing around with Sculpey for a while now, mostly making little animals and gnomes for kids, but I saw this and in the spirit of onedownsmanship decided to try my hand at a green devil face too.
The “wall” is a bit of matte board covered in balls of Sculpey, and the base is a big metal washer to keep it from falling over. I had to add a mound of Sculpey to hold the wall on it, but it is reasonably inconspicuous painted black. The whole thing is a little big, but still within reason.
Then I saw another great idea here. My version is definitely a lot cruder, but was fun.