I used the flickering orange LED of the tealight for the sparks and conveyed it by optical fibres to the nostrils. To simplify things, I connected the LEDs for the eyes in parallel to the circuit board of the tealight since it has it's own battery pack and on/off switch. To do this: first remove the cover from the tea light. Break off the excess plastic (so that it can fit into the dragon head/neck). Connect the two thread from the LEDs to the circuit board, be careful where you attach it, on some spots the eyes will flicker as well..