Need Creative Ideas About Level Design- No Skill Required

I am making a game where four cubes need to work together to defeat the evil cylinders. Each cube has its own ability to fight off the cylinders, and my friend suggested that we create objects that the only certain cubes can interact with, so that they have to work through the level TOGETHER!! So the Red cube has a flamethrower, and I created an object that flashes red (so the players know only Red can interact with it) and when Red uses its flamethrower on it, it burns. This is used as a wall that only Red can help the team get past. But I need some objects that the other characters can individually interact with similar to how only Red can interact with the flamable wall. These have to be able to be implemented into a level (like perhaps a switch or a bridge only one player can walk on) and have to have something to do with the players ability.

Blue's ability is a high powered water gun. Green's ability is the ability to shoot spheres at the cylinders (kinda like a Nerf cannon) and Yellow's ability is a yellow shield that is made up of pure energy.

I will take any number of ideas you guys give to me. Feel free to vote on ones that you think are cool! Thanks!