Window Smear

This is another bitmapdata effect. In this case, a drawing and clearing process follows the user's mouse around. The clearning isn't perfect, though, and so it leaves some smeary trails in the bitmapdata. The actual drawing is really pretty similar to the glitterbeast example, although the alpha images used are a bit different (and the mouse controls drawing rather than a random walk).

Download the source for this file here. You might need to right click and select "Save As".