I got jealous and wanted my own interactive background. Plus @miketaylr’s is mad sweet. Turns out, I’m lazy. Never fear. Mr Doob recently put out the magical canvas procedural illustration application Harmony and generously licensed it MIT.
Leveraging code from the $1 Unistroke Recognizer (which is righteous), it takes snapshots between drawing pauses and looks to see if you drew a star. If it thinks you did.. then:
Take it for a spin if you like. Experiment with some of the other brushes. Thanks again to powerhouse Mr Doob for sharing such beautiful work.
(I’ll probably be removing the drawing canvas in a week or so. It’s a bit of a resource hog!)