This is the first time I've ever seen one of our gray tree frogs with any hint of green on it. Evidently they can go totally green, enough so that they near-identically resemble the common green tree frog found in the southern US. I suppose there had to be some reason its species name is "versicolor".
An acquaintance brought this one back to Cape May County after it had apparently hitched a ride to the city when he went home after a visit this past summer. Must have been just enough green in the substrate of its holding container to start the change. Luckily, I found a lichen-covered tree that perfectly matched the frog!
Looked pretty good on red (Dave's shirt), too.