The National Institute of Standards and Technology (NIST) recommends that every school bus be painted National School Bus Glossy Yellow, except for the hood (optionally) and bumpers which must be certain shades of black. Similarly the Manual on Uniform Traffic Control devices dictates the red on every stop sign (and it's caught on in a bunch of other countries as well).
Is it time for an energy efficient palette as well? Maybe, maybe. Thanks to Microsoft and HP, we already have RGB hashed out, but I'm talking about developing a palette of colors to use in broadcasting and web design that minimizes the amount of energy used for display. Like the stop sign, it might only take one country to mandate it for it to go global.