I know you can buy these at the store for about 2 bucks, I created this one to have someones name on the flat portion. I was told that it works well, better then the one in the store.
I printed it in ABS (PLA would work just fine) with 25% infill and it is as sturdy as a brick.
I would love to see what you do with this, please click "I made one" and send in your pic.
I sell these on http://www.3DHopper.com for $10-$12, custom ordered

Printed with ABS with raft and supports. Try angling it and add supports with MeshMixer for a cleaner look