I aim to misbehave.
JEDIT: Heck, as long as I’m redesigning them, I’d go with a light, golden green for Fellowship
…but mix that into a darker, tattered gray:
…and the design on the cover would be that of the doors of Moria:
I’d do dark blueish green and burnt sienna for Rohan, with the leaping horse and Celtic designs:
And a mixture of red and black for Return of the King, with the white tree insignia of Aragorn: