Wow that is awesome. I dont like the Amanita Muscaria though They're not really "shrooms". Some fat psilocybes would be cool!
I searched shrooms on deviantart and got this, I think it is amazing, and was quite possibly made by someone on shrooms.
That's the first thing I noticed, as well, but I think the colors worked rather well in this piece. Plus I love the color of Amanitas as it is...