The LEDs are flashed in sequences using a 08m Picaxe microcontroller. See pic19. The resistance of the conductive glue joints is high enough that no dropping resistors are necessary. In order to keep the leads to a minimum, Charliplexing is used to control the six LEDs individually. This is a simple way to use 3 wires to control 6 LEDs.
I will try an post a video of the flashing pumpkin head LEDs and code when I get more time.
For details on Charliplexing see: http://www.instructables.com/id/Charlieplexing-LEDs--The-theory/
I did not have time to make an embedded control circuit, so it was just breadboarded. See pic20.