I have noticed more and more photographers using textures of various sorts in their images. I must admit I have been playing with them a little myself. Here are a couple that I have made myself which I have not copyrighted. Feel free to use them and you can get a high resolution copy from Flickr, linked.
If you do use them remember to give a credit (Texture by CStGPA). Thanks and have fun.
The first is dead ivy leaves
The second a stone wall