So, since I created an Earthworm Jim thread, and I'm feeling kind of sad that it's getting ignored (since I put a lot of effort into it), I was trying to think of which stages could work from his games. So far I've boiled it down to two possible levels:
New Junk City and
Level Ate.
(Mockup by Birdman91 on deviantart)
(Screenshot of SNES Level Ate by HardcoreGaming101)
(My own crude mock-up of New Junk City in Smash)
New Junk City: This stage would be an asymmetrical platform stage. The central platform would branch into a lower section and an upper section with a junk school bus that players could enter. Crows and rabid dogs would zoom by in the distance but bring no harm to the characters. Two smaller platforms would be in the upper left and right corners of the stage, as well as a conveyor belt on the upper right corner that can be stood on.
Every so often, the conveyor belt begins raining a bunch of garbage (pieces of which include tin cans, goldfish bowls, old TV sets and moose trophies). Players can take shelter from the damaging garbage rain inside the schoolbus or on the bottom platform, but things can get hectic as you can push the players out into the garbage rain. Also, a tower of tires would randomly collapse on either side of the central platform, which would cover up the bottomless pit with a safe bouncy pile of tires until it eventually sinks offscreen.
(My own crude mockup of Level Ate in Smash)
Level Ate: This has the potential for being a fun large level. The central area is two platforms made out of bacon, sheltered by a large juicy steak impaled on a fork. Next to the bacon pathway would be a pair of salami links. On either side of the center bacon platforms, there would be a pizza box and a large skillet. Players can stand on the skillet, pizza box, salami links, steak and bacon platforms. They can also stand on the eggs, although they are destructible.
Players on the bottom bacon strip could turn on the skillet by hitting the large dial next to the platform, frying anyone who's on top of the skillet with fire damage. Two large eggs are suspended over the skillet - by attacking them, they will crack and drop their yolks onto the skillet. If they are dropped on the skillet while it is on, then they will cook, during which time they can be used as platforms to safely stand on top of the skillet. Once the skillet turns off, any cooked eggs remaining on top of the skillet can be eaten to regain health. If eggs are dropped on the skillet while it is off, the skillet will become slippery. Once the skillet has been used, its control dial will fold back into itself and it will be some time until it can be used again. Broken eggshells suspended over the skillet periodically will be pulled away and replaced with new fresh eggs.
On the left side of the bacon platforms is a large pizza box (despite how it's depicted in my picture, it is actually another large platform, not a walk-off.) Periodically, the box will open, revealing a piping hot pizza inside. Players on top of the box when it opens will struggle to keep their footing as the box can potentially fling them into the abyss below. Inside the box is a large, piping hot pepperoni pizza. Players can walk on the pizza, and stand on its toppings, but if they stand on the cheese, they will begin to sink and have trouble moving. If fully submerged in the cheese they will gradually take heat damage from the pizza. They can stand on the slices of pepperoni for safety. (I imagine the toppings would be changed to reflect regional differences - Japan has some rather unusual pizza toppings that wouldn't make sense to us westerners).
Finally, players would randomly be besieged by random salt shakers flying throughout the level. They can take shelter underneath the various objects to stay safe, but while being attacked by salt shakers they will take damage.