These are martini glasses that have gorgeous blue legs, however top of the glass is clear. Blue light was used for the top blue effect.
moderator note: this building does in fact have blue windows and is not just reflected blue sky.
Multiple exposure inside the camera, no PS
Flash was fired through the base of this blue glass vase producing the blue lighting effect.
Compression hurts blue almost as much as it does red. If you have time, please view all the contest entries in full.
Couldn't find anything blue, then looked down at my "My Book" external HD. The blue reflection is off of the back of a dvd. The green is from a T.V. turned on above the dvd.