This is very nice, brings back certain memory to me. Back in high school, I've told some girls that what I want is a black rose. They tried dipping them in watercolors but the diluted paint won't stick to the petals.
someone mentioned that to me a while ago and I hadn't seen the movie since i was a child.. so i had to sit down and watch it :-)
It was actually inspired by my wife, she loves roses and she likes the colour blue.. so it was my way of telling her i would do anything for her, even paint all the roses blue!