What you will need:
Plastic Geometry Set
Circular Polarising Filter to fit your lens
1. For the effect to work your computer screen has to be white, either
as a Background Theme or Screensaver.
2. Arrange the items on the in a way you like
3. If DSLR has Live View (turn it on) and turn the Polarising filter, as you do so the screen will go black, and the Geometry set will show its Rainbow colours ( it may take some fine tuning)
4. Tweak the Exposure, Select Aperture-Priority (A or AV) and use setting liek f8 or f11