Lizard Skins makes several different sizes of clear self adhesive bicycle frame protection "patches". One of these could be cut to make a number of smaller sizes:
http://www.amazon.com/Lizard-Skins-C...ef=pd_sim_sg_1
Or, you could just check your LBS, as I've found a couple of different sheets of various size clear frame patches in the past (I think one of them came from Trek).
John