RR those colors look a lot like sandstone tiles we have all over the place here in Arizona. I see them constantly, it would be no problem for me to take a close up photograph of some of the more interesting ones to use as a background texture. I've been thinking of doing this anyway but this would give me added impetus. Not sure if I have a good enough camera but if you are interested I will post back. If not, I may just create one for myself.