careful using it tho - it has a tendency to get rid of detail and make the colours all the same   - which is why using it in something like this where the blue background is featureless is fine (the get around for the loss of colour detail is to put a small white layer on top of the area with some chromatic grain and then blend it with multiply).  Takes a bit more tweaking to do it in other circumstances.  Oh and you can use pretty much the same technique to make people look thinner ;)

"In every colour, there's the light.
In every stone sleeps a crystal.
Remember the Shaman, when he used to say:
Man is the dream of the Dolphin"

Rich Meadows Photography