I don't really know much about them, but as far as I can see they appear to be cosmetic, i.e. they make a facebook page look nice. Do they have any other value?
Ok so we have established that it can make a profile look nice, and that could encourage a visitor to explore it further. Has anyone actually used one, and if so did they notice any benefit from it?
As I said, I don't really know much about them, I just did a google search, here is an example of what I found: http://www.facebookpagetemplates.com/