Allright ... Here is my opnion .. I have always been a little scared of making a move on a good friend .. You should ask yourself how valueable is your friendship? This is important because if she doesn't have the same feelings for you and you let her know or show her that you have "more then friends" feelings it could ruin what you have. I speak this from experience. Flowers are a good touch .. if you sence the vibe from them is bad, you can always come back with you deserve them, or something along those lines...
Let me ask you this ... does she talk about other guys around you?
Good luck and keep us posted ...
They may forget what you said, but, they will never forget how you made them feel ...