Red is hot and spicy, like standing too close to the fire. Orange is warm and smooth, a velvet curtain heated by the sun. Yellow is buttery and rich, like sunshine on your face. Green is earthy and comforting, the smell of fresh pine needles. Blue is cool and crisp, like dipping your foot in a lake in October. Purple is dark and rich, a baritone sax bellowing jazz. Brown is healing and ancient, the smell of earth on the forest floor.
[from a Reddit comment]