Holiday sites are often one of the best parts of the year at an agency because you can go crazy with what you do. In 2008, I helped create this 3D experience for Colle+McVoy which started by building a mini model of a snowy place called Snowdin.
Different area of Snowdin allowed you to play games, download snow-themed papercraft and all around just waste time. Clients were sent a pair of branded 3D glasses to enjoy the 3D experience. The rest of the internet was able to send an email and receive a pair of their own – until we got overwhelmed and ran out.