I usually see purple when I get stuck in traffic jams during the summer with the A/C on.

If you really want to understand the State of Charge bar graphs, you might want to look at the following web page:

http://privatenrg.com/

It's oriented towards simulating Prius mileage, but most of the information is applicable to the Camry Hybrid. Look towards the bottom of the page for battery state of charge information.