Carve it up the way you want... then paint the insides of the pumpkin black.

The contrast will really make the carving pop.

Or paint the exterior of the carved pumpkin - either way, you want to increase the contrast in order to make the details stand out.

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I'm a Halloween Bride! 10/31/2002

Where there is no imagination there is no horror.
~Sir Arthur Conan Doyle