Texas is not really known for big sand dunes, but there are some here.  One nice field is in Monahans State Park, west of Odessa.  I like to stop there on the way to Big Bend National Park.

Most of the dunes at Monahans re overgrown with vegetation, but a handful are really nice, with some good shapes and forms.

I shot this image in color originally, then converted it to black and white.  I used a polarizer to help pop out the clouds and to darken the sky and shadows. No sense being subtle here, I figure.

Monahans Sandhills

Canon 1Ds Mark II. 21mm.  ISO 50.  [email protected]/4 second.  Polarized.