I was looking at that graphic and I suddenly thought to myself 'damn that looks really close to a keeper of secrets'.
So I tried to turn it into a keeper of secrets with a time limit of 5 minutes. I ran over that to 10 minutes and still ended up with a very rough looking keeper of secrets, but it was fun to try and work fast, just doing basic shapes. Maybe someone can use it as a base if they can be arsed to improve it.