Same as before, but without the food coloring, and color adjustments in post.

I used about half a cup of vegetable oil, and about a fourth of a cup water, with a bit of red food coloring. I placed the water/oil concoction, into a glass pie plate. I then used a clamp light attached to my camera's tripod, to light the concoction, from below, and at a slight angle.

Camera was my trusty 350d, and the lens, was actually two lens's... I reverse mounted my Canon 50mm F1.4 to my Sigma 105mm F2.8 Macro.

Once I got the photos into Photoshop, I used the "color balance" tool, to make all the colors as wacky as they are.