Fun House!
Any graphics folks who have Tiger (or anybody who likes a graphics toy) should check out the amazing Core Image Fun House. Install the Developer tools from the installation disk, then go to the Developer Folder on your HD. It's in Applications/Graphics Tools. Open any image on your system, then click on the + sign in the Effects Stack window (the one in the box that shows the image, not the one at the top) and you'll see all the new Core Image filters and can apply them, then save your results as a jpeg or tiff... Spiffy!
Delicious
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Also...
try Quartz Composer. It's a... modular graphic synthesizer. With video input. And MIDI controllers. And it does RSS feeds (guess what the RSS screen saver was made with?)