Camouflage

Upon finishing the spell, your skin and clothing change color, warping tint and hue to match your surroundings.

(Spell Compendium, p. 43)

Originally posted on D&D tools

Transmutation

Level: Druid 1, Ranger 1,
Components: V, S,
Casting Time: 1 Standard Action
Range: Personal
Target: You
Duration: 10 Minutes/level

Throughout the duration of the spell, your coloration changes instantly to match the background of any new environment you enter, with no effort on your part. This effect grants you a +10 circumstance bonus on Hide checks.