Well for the past while I have been trying to make a coaster with a certain flare. After trying and failing so many times, im going to pass on my idea, A pinball coaster, not like the prototype, im talking a pinball machine, with a coaster inside. The pinball machine could be a big 3D and the pull start on most pinball machines can be a launch sectioon for a coaster, and have the whole coaster tilted at 25 degrees or so with inclined loops and helixes around bumpers and what not.
Well that is one of my ideas, this thread can be used to spread your ideas, like a ceiling mounted inverted coaster or a bath room coaster.