Check out these color-changing umbrellas from UK-based Squid London. At first it may appear like a plain looking umbrella, but once it gets wet, the white patterns in the umbrella will be filled with amazing colors. It Uses special type of ink called hydrochromatic ink, which will shift color in response to water. Pretty cool! Unfortunately, the umbrellas are a limited run and they seem to be sold out. [OhGizmo]
