I am working on a scrap one..... I've gotten 14 (inner) blocks done-- basically 3 levels out...i know most have 4 levels, but I am considering skipping the fourth or just making that my pathway/connection color. If I do 4 levels and then my pathway, this thing is going to get bigger than I wanted it to be. Each block is generally one basic color with different patterns/shades.
I wish I had the eye for the fancier patterns that almost look like a kaleidoscope, but I don't.....some I have seen online are gorgeous!