Abstract: So, did you do Greg's gels assignment? I did. Twice. Below are my results, and what I learned.
Reporting in from our last assignment, in which you were asked to shoot a portrait in three different ways: clean white light, warm/cool light, and warm/cool light with the shadows muddied up with a little green. I did this one along with you—twice—and learned a lot in the process.
Which brings up a valuable point. You can read about this stuff all you want. But until you actually get off your ass and do it, you're not going to learn it.