This is 3D OpenGL eye-candy for Mac OS X, complete with customizable settings, and full source code.
The implementation might be interesting – the options interface is build using Interface Builder, Objective-C and Cocoa, yet the actual drawing code all happens in C++ using OpenGL.
Props to the folks at Cocoa Dev Central for posting a pair of tutorials that got me started with building screensavers in Xcode.
Download: DancingSpirals.saver.zip