"Sure," the vendor says cheerily, and takes the flower to tie a cute little ribbon on it. In your purple, no less.

But they pause, looking at it-- then at you-- and reach into another bunch of flowers; the one they retrieve is not a rose to your eyes, but a yellow tulip, and they tie it together with the rosebud(which, frankly, looks vaguely wilty. but hey).

They hand it back though, smiling. "There you go. On the house."