I am pretty sure I'm not patient enough to create layered jello, but I appreciate it's awesome stripeyness
Rainbow Gelatin Orange Wedges! In the comments people suggested using Jello Jigglers recipe and also turning them into sailboats for a kids party by adding a toothpick and sail! Awesome!
Rainbow Jello : 1 small box of jello for each color & 1 large tub of cool whip. Prep 1st color as directed using the quick chill method. Pour jello into glasses reserving about 1/3 of the liquid jello. Put glasses in the refrigerator & chill for 15-30 minutes or until slightly set. Mix about 1/3 cup of cool whip into the remaining jello. Pour the jello/cool whip mixture on top of the slightly set 1st jello already in the glasses. Repeat process for each color.