Click the "Generate" button on top of the screen and see the results! You don't need to follow all 3 of the ideas, but you can! Some may be wacky, but you can always generate again and again! For people who don't know, the "scratch" genre just means to theme it around scratch itself.
For the cool background effect, change the backdrop to a red one, with fading color on top which is slightly different. Then add a color effect forever, at the rate of 0.5 or 1.