Hello, I was just experimenting using my camera's built-in flash using the palm of my hand before the light to color it and reduce its luminosity. It worked like a charm. I got a brilliant soft amber hue which I absolutely adore. I then used the semi-transparent cap of a tupperware container in the same place and got a brilliant yellow light. I was thinking of experimenting more and searched ebay for "semi-transparent flash color cards" but got no results. Are there commercially available cards which can do this? I can hold it by hand for the shot. Thanks!