
This is my pumpkin with my wife's pumpkin (she made "for my daughter")

This is my Pumpkin in the night...

... and so is this.

Notice the flames?
Figured this out last year: carve your pumpkin so that is has a bit of a "reservoir" (high mouth basically) then fill this reservoir with rubbing alcohol (I've found it has to be 70% or higher alcohol content)... then you light the alchohol on fire and basically the entire inside of the pumpkin is one big flame... and since it's rubbing alcohol it doesn't get much hotter then if it had a candle... works best on a moist pumpkin.
keep an eye on it and ensure it's somewhere where the flames won't light anything, top up the alcohol reservoir if it burns out ( I found about a half cup lasted about 20 minutes... you can buy the alcohol at a dollar store though so it's worth it.)