Did you steep all of the grains? How long and at what water temperature? Did you add all of the malt extract?
Originally Posted by dudius
I'm just curious whether color comes more from the grains or the malt.
All grains are malted grains (except for a few like roasted barley, flaked cereals, etc.), and they are what gives the beer color. You may have added too much top up water at the end. Did you take a gravity reading before you closed the fermenter?