Last week my husband came home from a trip to Whole Foods, clutching a bag of dark grains in his hand. (cookincanuck.com)
For really brown bread, you'd want to look to darker grains like quinoa, teff or even unblanched almond; for flavor but not necessarily dark color, look to buckwheat, millet, or sorghum. (gfjules.com)
The very dark grains are rated at 300 + Lovibond and give off a rich roast character. (ballastpoint.com)