Learning photoshop for my textures


I have been modeling for a year and now I want to get into textures and compositing.

I was wondering, can Photoshop do these images ( http://www.cgsociety.org/gallery/forum/132/) I filtered Photoshop paint gallery.

I was wondering if I digitally paint a image texture say a wood tetxure, then use vibrant colors and or the paint or smudge tool?