You can hide yourself in sand with a moment’s notice.
Prerequisites: Hide 5 ranks, Sandskimmer.
Benefit: As a standard action, you can quickly camouflage yourself in any area of ash, dust, loose earth, or sand that is at least 1 inch deep. In areas with 1 to 11 inches of appropriate loose soil, you gain a +4 bonus on Hide checks. In areas with 12 inches or more of appropriate loose soil, you instead gain a +10 bonus on Hide checks. You must still have cover or concealment to make a Hide check.
See Determining Loose Soil for finding the chance of sufficient ash, dust, grit, loose earth, or sand existing to use this feat.
Source: Sandstorm, page 51.