SEXY VALENTINE: Perhaps you're a person that likes to go with a phone call and a hug on Valentine's Day. Or perhaps you're a person that waits all year for February 14th, and then, when it arrives, you go to the top and over with showman- or showwomanship. The fancy flower arrangement is for you, if you count yourself a Valentine's expert. Couture flower specialists Empty Vase offers a full-on rose-laden topiary they call the Sexy Valentine. We're trying to picture the faces of the people who receive this one. HEART-SHAPED HELLO:It's $375, at the Empty Vase.