Odd & Weird Stuff: How Well Do You Know Your Shit? - Shades of Poop
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Brown:
You're fine. Poop is naturally brown due to the bile produced in your liver.

Green:
Food may be moving through your intestine too quickly. Or you could have eat alot of green leafy veggies, or green food coloring.

Yellow:
Greasy, foul-smelling yellow popp indicates excess fat, which could be due to malabsorption disorder like celiac disease.

Black:
It could mean that you're bleeding internally due to ulcer or cancer. Some vitamins containing iron or bismuth subsalicylate could cause black poop too. Pay attention if it's sticky, and see a doc if you're worried.

Light-colored, white or clay-colored:
If it's not what you're normally seeing, it could mean that bile duct obstruction. Some meds could cause this too. See a doc.

Blood-stained or Red:
Blood in your poop could be a symptom of cancer. Always see a doc right away if you find blood in your stool.