Back in April 2007 we created a Birthday Cake Decorator ecard for MyYearBook.com:
http://pimp.myyearbook.com/toys/birthdaycake/
In less than nine months there has been more than 2 million birthday ecards created!
The Birthday Cake Decorator is part of a series of ecards we have created in the past years. Each of them won the Macromedia/Adobe Site of The Day. You can check the rest of the ecards here:
https://www.theoworlds.com/ecard_campaigns.html