I made this 2D level design from a 3D program. I posted stuff like this a year ago or so, so here:
http://imageshack.us/f/696/77043595.png/ (http://imageshack.us/f/696/77043595.png/)
I didnt add rings or sonic cause i was in a rush. But the lighter blue is the background and the darker is foreground.
It could flourish into something awesome, but it's very basic right now.
Great work...this shows you have taken great efforts for it.