Need more grip!!!

[gilbequick]

I've got an OtterBox on my GS3 and the back of the case is smooth plastic. That makes it tough to work one handed, it keeps sliding around. I'd like a Flygrip but I refuse to pay $30 for one of those, that's ridiculous. Any suggestions on what could be added to the back to give it a little more grip, but not so much that it pulls when taking it out of my pocket?

 

[gilbequick]

Anybody?

 

[EnlightenedSoul]

You can always use skateboard grip tape.