We think fans are a lot cooler than air conditioners when it comes to being green; they use a lot less power. However they can be pretty boring and haven't changed much since Philip Marlowe had one spinning in his office in The Big Sleep.
Not any more; The LED Art Fan has 42 LEDs mounted on the blades of this retro art deco fan, which uses persistence of vision (seen on bicycle wheels here) to create bright images. 5 meg of memory holds up to 128 frames that you can spin, slide, flash and dissolve and stay cool at the same time. Software for Windows 2000 and XP lets you import GIFs or "Show off your m4d 4rT 5k1Llz" drawing your own frames. $ 389 at ::ThinkGeek via ::Technabob