Flower-shaped floating monument with flowing water, redstone powered. It's kind of random but it evolved into something cool. It's hard to explain in text so there's a bunch of images and a video.

For some reason the hopper-clock in the base that powers it all gets broken when you paste the schem file, you just have to break the output redstone dust and replace it to fix. There's a lever on the other side to turn it on and off.