|Dangerous Pumpkin Stencils|
Phil's design qualifies as "hard" and you'll probably need a rather large pumpkin. You could also use an image editing program to resize the stencil if you want it to fit on your pumpkin better.
The patterns are guaranteed to work, in that there are no mystery suspended bits of pumpkin or anything. I haven't tried them on a pumpkin yet myself, though, so I'm not sure how well they'll carve up, depending on detail. You might need a "skinny" pumpkin for Phil, since he's more detailed. I tried to make them so there weren't any really heavy parts of the pumpkin being held up by just little attachments, either. 'Cause those suck, they get weak and break when they get warm and/or older than a couple of days.
Also, if you DO carve a pumpkin using these, for heaven's sake, take a picture and send it to me! I want to see!