A simple circuit held together and insulated with Sugru (I used Orange, but you may use any color you like: Orange was harder for me to "lose" however :-)
Step 1: A list of the materials
One packet of (in this case) orange Sugru.
two wires, a few inches long
two things used for contacts (copper shielding, pennies, etc.; I used a cheap solderible
charm from a bracelet that had disintegrated, and the back of a push pin tie tack).
one neon bulb
and one 33 K resister.
a soldering iron,
and one heat sink for the bulb (while soldering); I use a hemostat