When we have below-zero (F) temperatures here, frost crystals form on my sunroom windows and make interesting photo subjects as each is unique. I was processing this one in CS5, Nik Viveza 2 and Color Efex Pro 4 to increase contrast (black background/white crystal), but wasn't satisfied with the look I was getting. Almost by accident, I tried the Negative (RGB) preset in Curves and thought the different look was intriguing. This was followed by a B&W conversion and addition of a blue tint. 5D II, MP-E 65mm at about 2X, 1.3 sec, f/8, ISO 100, tripod, RRS focus rail, mirror lock, cable release. This is a focus stack of two images in Zerene Stacker. All comments are welcome and appreciated.