1: something like random paint splats and having them run and mix and just build up a random assortment of splatty shaped colours (with a mode that resets after a fixed time regardless of if you were enjoying the picture or not because screensavers always used to reset before the scene got too crowded and I'd never see the sheer magnitute of pipe dream pipes that I always wanted)
2: a pipe dream screensaver but with waaaaaay more pipes that doesn't end ... like ever