Ive been thinking...
Maybe make a force color forge like the flame forge where you can mix red, blue and green together to make a new color. The price system is like this:

The marketeers will look at your force created and figure out the price, so that we won't have a void color for only 30k. I will take 24 hours or so to look at the color. After 24 hours, the marketeers will soon pm you and make an image of it with its name. The pm will say 'press the accept button to successfuly make the force'. The price will be judged by the marketeers

When you want to sell it, the picture of the force will go on it.

Whatcha think guys?