I'm taking maternity photos for a friend tomorrow (first "real" photo shoot!) and I'm hoping to do some sillhouettes, but as far as I know she doesn't have a window that would work well for one. Is there another way to use lighting to get a good sillhouette?
Light from behind, whether sunlight or articifical will do the trick. This an example I took using a softbox that was behind and to the left:
You can accomplish the same thing with off-camera flash that is diffused or, if in a pinch, even bright home light sources with a sheet in front. Just expose for the background light rather than the foreground subject.