Step 1: Tools and Materials
Large glass jar with screw lid
Square piece of wood for base
Batten Lampholder (I used Arlec brand)
3 pin plug, 2 pin would be fine but you can't buy them in Australia (at least not from Bunnings)
Length of 2-core cable (use stuff designed for 240v)
2 wood screws (approx 25mm long)
Light bulb (low wattage or coloured)
Drill + Bits
Step 2: Cut Base
Once cut, find the centre by drawing diagonal lines from the corners. Drill a 5mm hole all the way through.
Step 3: Rout Base for Cable
1. If you have a Dremel (as I do) carve out the channel using your favorite method. I used the straight edge attachment and the multipurpose cutting bit. I started with the tool in the middle and cut a straight line to to edge. Be sure to clamp the base down when you are working on it. Other options include cutting the slot freehand with a high speed cutter or using the plunge router attachment. Maybe even using a chisel if you want to go old school.
Step 4: Prepare Lid
Drill a 5mm hole in the middle and 2mm holes where you marked before.
Step 5: Paint
Step 6: Wire It Up
As is printed on the packets of all 240v stuff, you must be a licensed electrician to wire work with mains power.
Now lets get to work.
Split the 2-core wire apart for about 14mm.
Strip 5mm of insulation from the ends.
Insert the copper part of the wire into the two side (unmarked) terminals on the lamp holder.
There are labels on the pics for more info.
Step 7: Assemble
Sandwich the jar lid between it and the base.
Thread the cable through the centre hole and out the routed channel.
Screw the lampholder into the base.
Wire up the other end of the cable to the 240v plug and you're done.