In iChat's video preferences, open the Special Effects palette from the Video menu. Select your Ghost effect, but when it says 'Step out of the frame', don't. Then the effect kicks in, you're ghostly but you are also part of the background. Arrange your ghost self, then do a screen capture.
ok i tried that.. but when my ghost comes out.. lol my other self is blue.. wut is the best way to do Lighting wise and background color... thanks.