Too spendy for me personally, but one of the better looking car diffuser devices I've seen: "Acqua di Parma meets Poltrona Frau, a symbol of leather know-how, research and design. Together, they now present the Car Diffuser, an object of design conceived in every detail by the award-winning design duo GamFratesi, to offer an enveloping multi-sensory experience and transform every trip into an unparalleled experience." Available in several colors and more than several fragrances, shown is the yellow ($175 for the case only at Neiman Marcus), which I'll take with the Aperitivo in Terrazza scent ($65; "The solar Italian elegance captured in a fragrance made of sparkling citruses where lime, blood orange and grapefruit together with a heart of gentian absolute followed by the warmth of cinnamon from Ceylon evoke the well known bitter accord.")