after watching A Short Film about Killing (from the decalogue)
and discovering the cinematographer made 600 hand made lenses i am dieing to work out how to do it!?

obviously i need some good quality plain glass and something to hold these bits of glass into place! But does anyone know what i need to graduate the glass with colour? Is there just simple glass paint that i can use to layer lots of thin coats of?

Any ideas, suggestions or answers would be great,
I'd mostly be using the filters to reduce contrast of sky and land on landscapes and to also add tints etc!