SpartanPride

I could, but it would look odd. Hair isn't one set of hues, its a whole bunch of hues.

WOAH, BRAIN FLASH

I could use that tutorial with a photoshop tool RedRob told me about recently. Make the beard with the tutorial, cut out a peice of hair from the original texture, and use the tool to make the beard-hairs the same color as the head-hairs.