These are studies of frost crystal patterns on a window. The differences in colour and brightness are the result of varying transmitted and reflected light due to the crystal orientation.
Images 'A', 'B' ... Canon XT, Tamron 90mm F2.5 macro lens.
Images 'C', 'D', 'E' ... Canon XT, homebuilt 3:1 macro lens - a reversed Zuiko 50mm F1.8 lens coupled with a Takumar 135mm F3.5 lens. To get a sense of image scale, the large vertical oblong crystal in shot 'C' is approximately 1mm in length.
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