Bob,
Many of the desert courses, Arizona specifically have paths more redish in color due to the natural sand used in the mix.
In as much as these tend to blend in with the non-turf areas better, if they are routed through the fairway or rough areas, they stick out regardless ...
The best place for a cart path in desert golf is in the, well, desert, which begs to ask the question, why do you need a concrete path?