I can offer two.
This group of carbon fiber seamless tiles was made using a different pattern than is commonly used and all over the web. IMHO, it does an excellent job of creating the illusion of a very even fibered carbon fiber. It is not photographic however. It is procedurally generated by an image editor.
If you are looking for a photographic rather than a computer generated fill, take a medium to high resolution photograph, square on and stretched out evenly, of an actual piece of carbon fiber fabric. You can then use
Genetica 3.5 to make it into a seamless tile or you can contract with me to do it for a fee (you still supplying the photo).