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Ideas

Morphing SVG

Draw with SVG, morph the dots/shapes afterwards.
Fades away after a while, falls, drifts from the get go, whatever!

Time travel

Ex. drag 2 fingers to travel back and forward in time (what about time branching though? How to handle?).

Voice regulated ...properties

Pitch → Hue
Volume → Saturation
Thus, no sound: all is black and white, a tram goes by, a dog barks and there are spurts of color! (Imagine the first time user's reaction).

...or no sound: Nothing happens, sound regulates the size of the pen.

Attribute sliders, changes history (as well as future/present)

Say there is a size slider; changes the size of what you already drew (easiest with vector graphics).