These rocks look too fake...

...the thing is, they are real!  The rocks in the images below are ventifacts.  Ventifacts are rocks that have been abraded, pitted, etched, grooved, or polished by wind-driven sand or ice crystals. These geomorphic features are most typically found in arid environments.

An image search on Google will reveal many other wonderful shapes although the 'stealth' rock below has to be one of my favourites.

http://cyanobacterialadventures.blogspot.co.uk/2010/12/hiking-about-part-1.html

http://clasfaculty.ucdenver.edu/callen/1202/Landscapes/Arid/AridLandscapes.htm

http://cygnetsailing.blogspot.co.uk/