This is really funny- I did the exact same layout for somebody about a year ago! Mine was only slightly different (he didn't want the buttons arced). I'll have to see if I can dig up the old file.
Edit: Here's a PDF of the layout I did. I think your version does look better. I never got to see the finished printed version of this though 
I vaguely remember seeing that one last year. I was working on mine around the same time and got it printed, it just took me
forever to get the control panel done.
You'll notice on the mushrooms, the color scheme (from the outside) is, thin white band, thick green, thin blue and then red. I tried to mimic this with the button section. Thin white, thick green, and then there is a solid blue circle. The buttons are what makes up the red.
I am extremely pleased with the way it turned out.
I'm glad you guys like it.
[edit] spelling