The Geonosian droid army was a large droid army constructed on the Outer Rim world of Geonosis. The army consisted of several B1-series battle droids painted in a dark color scheme, B2-series super battle droids, and droidekas.
It also consisted of a smaller legion of battle droids, which fought in a battle on Geonosis. These battle droids were a light red, sand-like colour to camouflage themselves with the surrounding landscape.
Unfortunately these stealth like, sand-red coloured battle droids were only produced in 2003 and retired in 2004. They are very rare.