I wonder if this idea couldn't be done better with a series of real life pictures. Like you choose 32 backgrounds of the world, then 128 famous people, and about 128 objects, maybe mirror the person on the other side. Something flying at the top of every picture. You could get it up to 32 bits quite easily and have a unique image that would be memorable.
Although I suppose this is meant for slight variations on names, so it works...