Dust Cloud( Savage Species, p. 33)
You can sweep dust into the air to hide from opponents.
Combat Reflexes (PH) , DEX 19, INT 19, Huge size, wings or tail,
As an attack action, you can sweep a limb across the ground and create a dust cloud. This hemispherical cloud has a radius in feet equal to 20 Ã— your Hit Dice. Creating the cloud has a 50% chance to snuff unprotected flames (candles, torches, small campfires) of nonmagical origin in the area. The cloud obscures vision, and creatures caught within are blinded while inside and for 1 round after emerging. Any creature caught in the cloud must succeed on a Concentration check (DC 10 + 1/2 your Hit Dice + your Str modifier) to cast a spell. The cloud lasts a number of rounds equal to 1 + your Dexterity modifier.
A flying creature with this feat must be within reach of the ground to create the effect, but need not actually be in contact with it.