Yesterday was Easter and some search engine related sites has special logos up for the day. Google and Yahoo did not have any logo up for the day. Here are some of the logos from the industry.
DogPile's Easter Logo:
Ask.com's Easter Theme:
Cre8asite Forums Easer Logo:
Bruce Clay Blog's Easter Logo:
Google did once post a special Google Easter Bunny Search a while back, but nothing really new this year.