A little flowfield experiment I couch coded in Codea for the iPad. Remade it in flash for fun, although the iPad thingy works much nicer due to multitouch and a better interface for adjusting the values.
Click and hold anywhere to start line flows
SPACE toggles blend mode and screen fade
UP/DOWN arrow keys scale the curliness
LEFT/RIGHT arrow keys adjust line strength
CTRL toggles noisemap visibility
F toggles fps and particle counter