If you play Nova Chain then you’ll notice the Melon Effect (see post below) before each level. Before I created that version I coded a sequencer for it so you can manually draw them yourself. This version allows you to pick the shape, colour and other parameters then draw on the screen and record it.
After building this I realised that the human drawn result isn’t as eloquent as a mathematically drawn pattern so abandoned it for some nice algorithms instead. However, it does remain a fun little tool.