Bump FX Java applet. Provides pseudo-3D effects on 2D images.
You can define the number of spotlights, as well as their speed, color and radius; and can define how they react to the user.

First test: 3 colored lights, small radius
Note: You can click in the image to activate, then move the first (red) spotlight around

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Find this, as well as more cool applets, at http://www.fxapplets.com/