Geckos Unlimited - A juvenile tokay gecko suddenly begins to change color and over a short period of time the change becomes more and more drastic—a very interesting thread!
Caatinga Color Changing
Frog Forum - A pacman frog goes through an interesting color change from a bright green to a rustic brown and is no less beautiful for it.@ Frog Forum
Ball-Pythons.net - A series of photos that documents that dramatic color change of a nice green tree python from dark red to bright green.
Morelia Forums - A young Sorong green tree python stays bright yellow until it is 18-months old, when it finally starts its dramatic color change with a single shed.
Bush League Breeders Club - One member is mystified when two of their ball pythons go through a massive color change after shedding out at about the same time.
Ball-Pythons.net - This is a very nice series of pictures illustrating the beautiful and dramatic color change undergone by a green tree python.