I wrote a couple of screensavers for macOS for those interested (unfortunately the “plug-ins” are not publishable via the Mac App Store).
They are called X-Galaxy and X-Vortex, both of which take up the M42 nebula in Orion, like the Snow Leopard theme, this time in 3D glory.

Download Screensavers
1.5MB macOS 10.6+ (universal 32/64bit).