Thats a great idea. Or perhaps, if your commander only have one color, you can add an additional color. I am new, to Magic, and i am currently thinking of building a only green deck, because i like the commanders. But i would really like to have some Black cards as well.
Add one new color identity to your commander. (You can only play those cards with this Color identity after you have added the new color to your commander´s color identity.)
Add one new color identity to your commander. (You can only play those cards with this Color identity after you have added the new color to your commander´s color identity.)