One of the most useful pieces of lighting gear a studio photographer can have doesn't actually have a light in it. Check out how v-flats can help you shape your light in this great video.
Coming to you from Manny Ortiz, this helpful video shows how he uses v-flats to shape his light. If you've not seen them before, v-flats are basically large pieces of foam board or something similar that are hinged in the middle and have black on one side and white on the other. Having the black on one side allows you to deepen the shadows on your subject, while the white on the other side acts as a reflector. In addition to controlling light, you can also use them as a background or to build a set. Oritz is using a pair of V-Flat World Portable V-Flats with just a single light; if you don't need the extra portability, you can also make your own.
Of course, there are some drawbacks to using v-flats, the most obvious probably being that they're not really meant to be used outside, as the slightest hint of wind quickly turns them into sails. Check out the video above to see how they can change the look of your photos.