A Worn Passport

My passport is starting to get kind of beat up (well, both of them). The US passport's cover is fraying at the edges and has little strings coming off in every direction. The spine is kind of bent and misshapen. Some of the pages in the middle are yellow or brown at the edges. The UK one is in better shape on the inside, but the foil on the cover has now worn completely away leaving me with an ambiguous European Passport.