jQuery Masonry layout for WPF?

http://www.queness.com/post/11133/the-famous-pinterest-dynamic-grid-layout-and-design-inspirations

i would like to create a custom Panel class to emulate the layout like the ones in the link above. Has anyone tried it yet? Or anyone can let me know the algorithm to position the different sized tiles? 

The grid photogallery on fdeck is what I am achieving. Anyone has the source code or links related for the grid layout? 

http://reface.me/wp-content/uploads/silverlight-facebook.png 

Thanks!