Water drop photography
Taken with a Nikon D90, 50mm f/1.8 lens, and a Nikon SB-600 Speedlight.
The SB-600 was used remotely via the commander mode of the built-in flash on the camera body. Imagine a square box that was used as the container for my water. In the bottom right corner was my camera and in the bottom left was my SB-600.
I took about 30 shots and got about 6 satisfactory ones. I then took these shots into Lightroom and edited them to have different hues and sharpened up the entire image. Here is the final product. Simple set-up, but great results! Try it yourself.