Click the above-left picture of Translucent Sheets applet to start the application full screen.
See Thru Bedding?
Here, the Cubic Bezier Class is used to generate an image mildly reminiscent of fluttering cloth.
This was only 3 kb before I added the components to make it intractive, 26kb after.
Control parameters cover blurring and scrolling, alpha, coverage, smoothness, and the number of curves involved. Coverage determines how small the increment between adjacent curves. Smoothness has to do with the number of points making up the line.
Click on the picture above left to see a large version.