Check out this interesting behind-the-scene video of a photoshoot. The video is about light modifiers for the light source you are currently looking at: your screen. Believe it or not, it provides enough light for charming portraits and bodyscapes. Download the light shapes from the LINK, put them into your favorite picture viewer and activate the full screen mode. Then just do what I do in the video. Your new light source will be fun to play with.
See, I TOTALLY KNEW those crappy Macbooks are good for something.
You can see the final pictures HERE.