The back side of a standard CD on a plain black board. Three drops of glycerine dyed blue with food colouring. Studio flash from the side. Canon 50D with Sigma 105mm macro. ISO100 1/125s f/11. Hand-held. C+C welcome. These would be good for the monthly RAW challenge as you could modify them considerably.
For this one I deliberately moved the camera. You can just make out the edge of the CD.
This is my favourite. The colours were boosted in CS4 with a 'Velvia' filter I have.
And the third.