Proporta.com has launched silicone iPod cases that change color based on temperature. The Color Change Silicone Cases are molded from impact-absorbent silicone to provide a thin, durable protective skin around the device. Colors include pink, blue, and charcoal, which gradually change to white based on temperature. Cutaways offer access to ports and controls, allowing iPod usage while the player remains inside the case. Color Change Silicone Cases are compatible with Apple's iPod nano model and ship with a lifetime warranty from Proporta.com for $20.