Playing in LDD I managed to use a bugged color to create a file which in the shown example changes the colors randomly. The colors are taken from hundreds of PF receiver outputs.
Here are just a few examples of the hundreds possible colors that can be generated
Before you use the file mare sure your shader match as following:
After opening the file with correct settings just move over the car and it will change color to a random one.
Click here to download the random color generator file