(Couldn't find an open thread for this one...)
If you got a crazy, off-the-wall idea for an "Experts Only!" track, this is the place to put it. No holds are barred: throw in track elements from other games if you want!
Example: A split-level version of F-Zero GX's Serial Jumps (the last Sapphire Cup race) that introduces a steep magnetized drop to the lower track in the last big turn. Major barrel roll opportunities here!