Online creative project that allows you to create a page with animated gifs, with the ability to arrange them in 3D:
Interactive Communal 3D Image Collage Platform
gifpumper.com is a real-time collaboration platform for creation of 3-dimensional image collages.
anyone can upload images, manipulate their size and place them in the 3d environment as well as adjust background settings.
by registering you can also create your own pages and modify their privacy settings.
While it is browser-based, it requires Safari or Chrome to use (no Firefox), and you also need an invite code to register (*ahem* but if you look at the profile picture on their Facebook page, there should be something there to help you with that *wink* *cough*).