another cool web app for interactive flame painting totally free no ads

http://weavesilk.com/

To access the controls (colors, type of symmetry, and there is a option to propagate spiralling toward the center ) click the dot on top left just below the share button

Ctrl+Z undo last stroke (only 1 level undo , but handy)

I like a lot the option to propagate strokes spiralling to the center (off by default )

This is fun! Thanks!

Reminds me of Alchemy.
http://al.chemy.org/download/

fun! nice find, photo comix

I found alchemy too hard to control, here is easier because there is not randomness , so once you get the logic you may control what will happen ... at least more.

I wonder why something similar is not available for Gimp or at least MyPaint
It should use very few resources because is available also as androids app