This is Jayftee's popular Raspberry Pi case modified so you can mount your Pi B+ on the back of your TV. Includes files for 75x75 mm and 100x100 mm hole patterns with and without vents. You can also make it fit any hole pattern you want by modifying the variables in the Solidworks files.
This thing only includes the bottoms. You will also need a lid from http://www.thingiverse.com/thing:423216. Use M4x10 screws to bolt it to the back of your TV or monitor.