Good tools for this kind of work are a very sharp paring knife, a fret or scroll saw blade, a potato peeler, a Stabilo marker, and some lemon juice to help keep the pip or meat of the pumpkin from discoloring so fast.
While these are great for daylight or well lit viewing, they would lose a whole lot of their character if they were only lit from within.
A lot of them would be fun to do with junkins, but you wouldn't get as many organic shapes as you do from nature.
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