From Stanford’s alumni magazine about Google’s doodler:

Also on his desk is a mug from the March of Dimes that provokes a wince. Last year the March of Dimes staged a public-relations campaign to get Google to offer a doodle promoting its project to raise awareness of premature births. Eventually, the group collected more than 75,000 signatures. Hwang does occasionally use suggestions from outside the company, and Google even held a Google doodle contest for British schoolchildren when it opened a U.K. office in 2005. But he didn’t accommodate the March of Dimes’ request because there are two hard and fast rules about the doodles’ subject matter. First, they avoid religious subject matter. Christmas, for example, is usually handled with secular images like snowmen or icicles. Second, the logo artwork is meant to be “fun and about Google, not about corporate beliefs or causes we support,” he explains. “We are not going to trivialize something that is extremely worthy by reducing it to a doodle. It’s why we won’t do a 9-11 doodle, for example. It would trivialize the event.”=