The Defense Advanced Research Projects Agency (DARPA) is working with Harvard University to create a chameleon-like robot structure. This robot can walk, change color, glow-in the dark, and respond to temperature. The robot changes appearance due to microfluidic channels inside its body that allow dyes to flow through. The robot has the ability to glow through chemiluminescence, and most importantly, achieve movement through pneumatic pressurisation and inflation of the channels.
Some links are given here:
Chemiluminescence of the robot
The robot changing color to match it environment.