That's a very provoking idea.
What we are discovering here is that once we get unchained from the fiat centralized currencies we are effectively discovering the real potential of money.
I agree with you that if this concept becomes successful it only would successful within the bitcoin network, I bet the outside is too stiff to handle this concept.

I envision service providers [similar to exchangers] that could provide trading with coloring verification, it is technically easy, but we need to bring it to the masses.

Eventually all merchants could use such a service so a potential client could see the price in different colors.

Now, I can easily imagine an explosion of colors which would compete with each other [I am treating the vanilla bitcoin here as a primal color] I wonder how easy could be to handle that complexity so it doesn't kill the concept.