I did a little searching, and found a few “alternate” google homepages. . . .

http://www.google.com/intl/xx-elmer/
http://www.google.com/intl/xx-hacker/
http://www.google.com/intl/xx-piglatin/
http://www.google.com/intl/xx-klingon/

Theres a few more, and the google searches don’t actually change the results, they’re just alternate homepages.

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Although those alternate Google homepages don’t do anything but look cool, Google does offer a few specialized searches.  Search for results pertaining to the US Government, Linux, Apple/Macintosh, or Microsoft.

http://www.google.com/intl/en/options/specialsearches.html

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And who could forget Google’s cute easter game with the bunny. . . .
http://www.google.com/intl/en/Easter/feature_easter.html