Here are two cool things that you could do with some special spray paint, some magnets, a power source, and some LEDs.
First is Electro-Graf.
It is your standard graffiti with LEDs embedded into it that can flash to a specific pattern. Here is how to make it.
Second is Fridge Lights.
This is adds Lightbright like functionality to you refrigerator. If I owned my refrigerator I would be thinking about doing this to it. Here is how to do it.
If you liked this stuff you would probably love LED Throwies that I posted about before. Check them out.
Today feels like one more significant step into the future, now only if we can get some sort of laser gun, and hovering cars.