I too have been bitten by the "Textures" bug that seems to be on the rampage at the moment! I have played around quite a lot with using textures to change (hopefully enhance) the feel of an image, but this is the first time that I have used one to basically change the background of an image.
This is the finished product:-
and this is the original straight from camera :-
I didn't like the busy background, and don't have the skills to extract these fine hairy seedheads from the image successfully so I;
1. Cropped and sharpened
2. Copied in a shot of some copper sheeting which I over-enlarged and blurred slightly.
3. Created a layer mask, and using an opacity of about 30%, cleared the texture away progressively from the areas I wished to keep.
4. Flattened the image
5. Made the borders using colours picked up from the image.
I'm quite pleased with the end result.
(I use Photoshop CS3)