Thanks, everyone!
I think I've my mind set om some reddish, dusty desert-like board with some red-brown/orangy cliffs for the wilderness portions... and then, of course, some cacti'n'stuff...
I know. lat to the party...
I lived in ElPaso for 4 years and later moved to Roswell New Mexico for a year (no, I didin't see any visitors). I can't speak for Arazona but most of west Texas and New Mexico look the same...a dry dull light brown (a bit darker than typical beach sand).
There aren't a lot of trees, and those you do se that haven't been planted by man, are short and dry without much in the way of leaves. Most of the ground that hasn't been cleared is simply sandy dirt with little weeds and shrubs, or more often filled with a 3-5 ft. tall dry black/brown shrub.
You can usually see some mountains or other off on the horizon, but these are also the same brown color. On these mountains you often find larger rocks, and some plants with long "bladed" leaves that are very hard and sharp.
To be honest, I saw very little in the way of cactus.