Could this be it?

I checked the lizard this morning, and the blue areas are much smaller and lighter than they have been. Not sure what triggers it, but the blueness definately varies from time to time.

I found this info on the web on something called a Colorado River tree lizard - looks pretty close to him except the blue under his chin turns really dark blue - kinda like a bearded dragon will, and also the blue on the belly is in a definate half moon shape and is a darker shade of blue than this shows.

Maybe it's a sub-species?
Link