What food would make my poop come out as small, hard, neon green pieces? did not eat anything blue but drank a lot of an artificial purple drink.

Change in BM.: An acute change in the color and/or consistency of a bowel movement could always be due to a change in diet, such as the addition of a new food or drink, or the withdrawal of a usual item of food or drink. If you are having abdominal pains or fever, though, you may want to consider the possibility of infection. If not, then give this a day or two to resolve and visit doctor if it does not.

Stool colors : The dye in your food may have broken down into a green color. Nothing to worry about.