Ah! Well the camera needed to be set at the lowest apeture setting (f/2.8 is the lowest setting for me) then I put a bit of coloured paper over the lens with a small shape cut out... http://i695.photobucket.com/albums/v...k/IMG_6018.jpg I've made a few of these with different shapes. It doesn't effect how much of an image can be captured by the camera but does effect the light going into the lens.
This us how I set up the shot...
http://i695.photobucket.com/albums/v...k/IMG_5955.jpg
With some boxes to elevate the geckos so the lights shine behind them
http://i695.photobucket.com/albums/v...k/IMG_5956.jpg
Good eh!

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