Klingon Screen Saver
Klingon Screen Saver is a Freeware Mac OS X screen saver featuring a 360 degree rotating logo of the Klingon Empire from Star Trek.
http://homepage.mac.com/niteowl69/.Public/Klingon%20Screen%20Saver.zip - 1Mb - Download - Screenshot

DogFight
DogFight is a screensaver with 3D rendered graphics. The Enterprise takes on a Bird of Prey in a desktop dogfight. See Starfleets Enterprise maneuvre against upto three Klingon Birds of Prey. You can set your desktop to shine through the background. ... New in v3. ... 0: sound, adjustable speed, explosions, ships can suffer actual damage visible in statusbars. ... 3 has new rerendered graphics for smoother animation. ... New graphics. ... v2.
http://www.xs4all.nl/~remcodek/zip/dogfight.zip - 669Kb - Download - Screenshot