I just thought of a crazy level idea. I'm not gonna attempt to make it, but I think it's worth it to share it to you guys.
It's modeled after the human digestive tract and the ball's texture is that of bubble gum.
Level name: Bubblegum Ball
First you start outside the body on a spoon-shaped platform. There's a mouth and the jaw is a MP. You need to use a super-speed and time yourself to get in the mouth, but if you hit the uvula, you'll be thrown out of the mouth by a vomit-colored MP. If you get past the mouth, a moving platform shaped like the epiglottis will repeatedly cover and reveal the respiratory system. You need to time yourself in order to get into the esophagus. By the time you reach the stomach, there are gems scattered everywhere and you need to collect them all. When you're done, you need to go through the low-friction small intestine. (Perhaps with a custom texture that's as slippery as ice). Slide your way out but, you'll go out of bounds if you hit a parasite. When you reach the large intestine, there'll be lots of gems there too. There's gonna be a poop-shaped, poop-colored moving platform that pushes you out. Luckily the guy is constipated, so the MP moves slowly, giving you more time to collect the gems. Then you go through the rectum and anus and finally find the finish pad. (ewww...)
Oh, and the easter egg can be found in either the pancreas, liver or gallbladder.
My cousin actually suggested that idea to me, but it wasn't bubblegum, you were just able to explore the human body. But I said it would take months of work to complete it, and you'd probably get tons of errors converting it.
Meh, I'd be surprised if someone were able to make that.