Wow! What a great project! I am impressed by your tenacity to continually rip it up and start over, I probably would have just left it as is!
I think using traditional fabrics was a great move. When you first glance at it, it just looks like a nice patchwork pillow. When you look closer, you can see the mushroom. Dare I say it is like an easter egg?
(I had to ask DH if easter egg was really the correct terminology, LOL)