Do they make an image go bye-bye or no? On the one hand, "Every creature within the area of the spell is the target of a combat maneuver check made to grapple each round at the beginning of your turn, including the round that black tentacles is cast..."
On the other hand, an attack roll IS being made. (Grapple check) The figments ARE objects, (see the comments about cleaving images in the mirror image spell listing).
The tentacles don't "see" visually...they basically flail about blindly, and mirror image has no effect on blind attackers... Any input?