The word "grainy" takes on new meaning to photographers.  We tend to do whatever we can to avoid grainy photos.  In a more general sense, grainy refers to texture...something not smooth or not fine.

With this photo, I converted the original image to black and white and then overlaid it with a blue filter.  Doing this made the flower pop from the "grainy" (not smooth) background.

Think about what grainy means to you.  Mix that with some blue and share your creative concoction with us.