i call it a bubble lamp and not a lava lamp because in its off state the "lava" sits at the top of the bottle, but as it is turned on and heated the wax sinks according to the room temperature and remains a static bubble.
you will need:
+ power plug
+ switch
+ glass bottle
+ metallic bottle holder (angle iron)
+ rubbing alcohol
+ paraffin wax
+ 30 watt globe
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Signing UpStep 1: Base & switch
you could go with the easier option of using a cable mounted switch. but i enjoy making mechanisms and creating more work for myself. so i went for creating a rotary switch using a brass knob from a drawer. i threaded a bolt into it and welded a washer off center to touch the switch, the video should explain.
invalid movie: http://www.vimeo.com/5487773
base
the base can be made out of whatever you want i used wood because it has a nice finish and made it much easier for me to router the shapes to create my switch.









































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Video
invalid movie: http://www.vimeo.com/5487773
Paraffin wax is called kerosene in most of the U.S., Australia and New Zealand.
http://en.wikipedia.org/wiki/Paraffin
Speaking of flammability, this alcohol/mineral oil formulation can be hazardous. There are versions using water and various organic solvents which are somewhat harder to obtain, but safer. See here.
USA=Paraffin wax is solid at room temp 19c 70F
the "lamp" section is on the far right of the attached image.
full sized image: http://lh4.ggpht.com/_Fu8rqNSZflM/Si36VYz5kLI/AAAAAAAAA3o/2QWH11Po868/kinetic-organic%20pan.jpg
could also use led's to illuminate the mixture in the bottle, But at what temperature do you have to have for the wax to move in the bottle...