I have found a bit of time, so I have decided to use a couple of photos I have managed to take a couple of days ago. Silly me thought working with textures will be much easier when the photos are taken in steady light conditions (overcast, no shadows). Apparently I was mistaken though, as the textures proved to be quite a tough case to handle. They had different saturation, lightness etc. Fortunately I was able to tweak everything reasonably well. See the result below.