Fading Shapes Screen Saver will draw shapes (bezier paths) that have a fading border effect, according to the settings you select in the "Configure" panel.
Interesting idea, seems stable, but while it's coded for OS X the images it produces would seem more at home on OS 6. Doesn't do much, but does it without crashing my machine. Immediately returned to using Flurry.
Free
Application is not under development & not supported.