Here is a small drawing desktop sprite animation demo. By desktop drawing I mean drawing right on the desktop without corrupting the contents of other windows. By sprite animation I mean moving, sizing, and rotating images.
To the right is a screen shot of the demo. It animates a piece of paper, pen and some swirling arrows. You can interact with the animation by dragging it around.
Ideas for extending this your own programs might include making your own animated application launch bar, displaying an animated notification icon, drawing animated graphs or representations of data over time, creating animated window decorations, or just about anything else.
Final note: Although this demo doesn't provide a way to control the framerate or CPU usage, it's a trivial matter to add it thus allowing you to control CPU usage. If this demo interested you drop me a note.