I just came across this on io9:

an amazing collection on “Project Sand,” a group blog devoted entirely to recreating the world of Frank Herbert’s Dune in concept designs. If you need to transport yourself to a world of spice, heat, and massive mining equipment, you’ll want to visit Project Sand, and check out all the designers there.

[From Bringing The Worm Home]

There is a trove of Dune related art available.