Here’s a great idea for a homemade vegetable oil lamp from Judy on the MAKE Flickr Pool. Check Judy’s site for detailed instructions.
In fact Judy has a ton of amazing Off-the-Grid how-to’s on her site like – Cold Vacuum Jar Sealing, Hydraulic Ram Pump, and Foraging for Wild Food just to name a few. One other particularly intriguing highlight was this sketch of a “Methane Powered Hypocaust”:

Great stuff – Thanks for sharing Judy!

Judy of the Woods – Link
Vegetable Oil Lamp on Flickr – Link
Methane Powered Hypocaust – Link

Related:

Lamp from Lightbulb – Link

MAKE: Blog Green Archives – Link