While I'm not a big fan of color solarization, I like to try it one in a while to see what happens. Starting with the base file of Decaying Tulip #1, I pumped up the contrast in Lightroom, then used Nik Color Efex Pro to make the solarization.
Technical: Nikon D700, Micro-Nikkor 105mm f2.8, ISO 1600, f/32 @ 1/40s. RAW file processed in Lightroom 2 and Nik Color Efex Pro. GPS