SRD:Ring of Chameleon Power

Chameleon Power: As a free action, the wearer of this ring can gain the ability to magically blend in with the surroundings. This provides a +10 competence bonus on her Hide checks. As a standard action, she can also command the ring to utilize the spell disguise self as often as she wants.

Faint illusion; CL 3rd; Forge Ring, disguise self, invisibility; Price 12,700 gp.