LEDs are famous around hackerspaces. Because expensive and not very common back in the 80s, blue LEDs are especially famous. In general, using blue LEDs is done only to use it for more awesome sauce.

In Sylvester Stallone's „Rambo 3“, Rambo is preparing for his killing spree. His assistant finds one of his blue glow sticks and asks him about it. Rambo tells him about it. See for yourself: http://www.youtube.com/watch?v=57xAshGXv3M