blue rose? spoiler!!!
Was this the movie that the hero had to find a blue rose to heal the princess, then she would marry him?
And at the end, he didn't get it back intact, so he took a white rose and said, "If you love me, this will turn blue?"
That was one of my favorite movies as a kid. I remember I HAD to watch it at my friends house, because they had a color TV and we only had black and white. And you needed color to see the rose change in the climatic ending.