Apparently these fake cereals with Google employee faces are showcased on some mini-kitchen at the Google HQ:

http://blogoscoped.com/files/google-cereals.jpg

More at Search Engine Land: http://searchengineland.com/070904-141959.php
[ Photo CC-licensed by Danny Sullivan http://creativecommons.org/licenses/by/2.0/deed.en]

Porn flakes for breakfast, too "hard" for me!

Some of those were pretty funny.

Other brands:

Ad Checks (Chex)
Spam Tricks (Trix)
Total Pagerank (Total)