Purple Pill: More of a pill to get you really high, really fast. Causes you to see everything in a new way.
Blue Pill: Causes you to get sad, depressed.
Orange Pill: Makes you become more focused and aware of those around you.
Yellow Pill: A 'happy' pill
Grey Pill: Makes things seem... unclear, a dizzy feeling.
White Pill: Causes you to see nothing but white nothingness, like an alternate reality of sorts.
Pink Pill: Makes you feel love.
Black Pill: Makes you feel pain, everywhere.
Red Pill: Makes you feel lust.
Brown Pill: Kills you.