Whether or not you're a fan of Captain Spock and the Starship Enterprise, there's no denying that Official Star Trek Icons are a faithful reproduction of all the famous symbols from the show.
The 2009 film remake has spawned all kinds of spin-offs and tributes and Official Star Trek Icons provides 15 free high-resolution icons. These include, of course, the U.S.S. Kelvin and U.S.S. Enterprise, as well as the famous insignia of the Starfleet and the famous Phaser gun. There's no Captain Kirk of Captain Spock or any of the characters from the show, however. To replace a standard icon with one of the Official Star Trek Icons open the Information dialog and copy the image to the clipboard. In Finder, select the icon to be changed, click 'Information', and insert the new Icon. Alternately, you can use an application like CandyBar.
If you like Star Trek, then you'll love these Official Star Trek Icons.