This small mount will allow you to mount these fans:
http://www.newark.com/multicomp/mc34115/axial-fan-15mm-3vdc/dp/25R6547)
to these heatsinks:
http://www.frozencpu.com/products/5518/vid-82/Enzotech_Forged_Copper_VGA_Memory_Heatsink_Multipack_-_ATI_and_nVidia_-_14mm_x_14mm_x_14mm_BMR-C1.html) adding a very cool computer style heatsink look to your Raspberry Pi.
Only tested on Ultra Detail and the everything fits perfectly.