surely gimp or PS would be easier and less likely to f*ck your cam up?

Ive got a plunger (thankfully not needed any more) that I could use to do that with a view camera You could of course just use it as an extension tube for super-Macro.

Hey heres another DIY project.  a really good macro lens, from a pringles tube :mrgreen:

clicky

If I had a few old lenses around I think id give this type of thing a go, but unfortunately I dont

You can do the same thing with the top post item, except you have the option of varying the macro far more easily. Only change is that you use a standard lens, not one for a bigger camera.