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Tan colored stools suggest you may have difficulty digesting your fats, which causes congestion in the liver and gall bladder. IBS and yellow stools sometimes occur. Gray/white ashy colored or clay like stools can indicate pancreas or liver problems. Also, possibly gallstones pancreatitis or cirrhosis of the liver.
Your stool can actually come out in a variety of colors. For example, black poop may indicate bleeding in the upper gastrointestinal tract, most likely the stomach. It could be caused by iron supplements, Pepto-Bismol, or (oddly enough) black licorice. Light-colored, white, or clay-colored poop usually means a lack of bile in your stool or bile duct obstruction.