A Batman-themed Nokia Lumia 900 desktop stand.
You can read a longer write-up of this here: http://www.wpcentral.com/cant-get-windows-phone-accessories-print-them
p.s. Due to the sync cable being at the top of the phone, it's not practical to include that in the design. Maybe next time, if I make a full-length version.
Print the bat and stand (N.B. PRINT THIS FLAT ON ITS BACK), then slip the bat into the grooves at the back of the stand. It should go in snugly.