I have been watching a series on Discovery Home and Leisure called Cutting Edge http://www.i2itelevision.com/woodworker.
In the program he used coloured plastic from standard A4 wallets to produce a diffused light. The light source was a standard strip light, and the finish product look great.
The other place to look would be professional lighting companies for film and TV, have a look at http://www.altai.co.uk or http://www.bluearan.com they seem to produce a whole range of gel sheets and rolls.
Hope that helps
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