Persistence of Vision is a FREE Ray Tracing Software, available for download from http://www.povray.org/
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Then I cut a lighter orange coloured sphere out from the inside and poked a variety of light orange coloured holes through to make eyes, nose and mouth.
The lighting is quite important for the overall effect. I positioned a light source outside the pumpkin, up and to one side. The other two lights are inside the pumpkin. One is a bright light close to the bottom of the inside surface, this is about where a candle would be. The other is a spotlight shining down on the first just to make the candle area glow a bit more.