Just watch and be amazed! This was relatively simple. I finished it in 5 minutes. Look in notes and credits to see how I did it.
I colored the stage with rainbow colors on one side and black on the other, and did "change [whirl] effect by [5]" and "change [color] effect by ten" in a repeat 10 times loop in a forever loop a. I put "set [color] effect to [0]" and "set [whirl] effect to [0]" on top. after that, i put "when green flag clicked" at the top. See, simple! Look at my results! Seems artificial