Innovative lightbulb made from a coke bottle filled with water and bleach! Water and bleach in bottle of coke was fitted on the roof. It absorbs and reflects sunlight and is equal to a 55 watt lightbulb.
Camping Hack: How to Make Fire With a Lemon (Fact or Fiction?) - I thought this was a pretty clever, although not terribly practical idea. While you may not have these types of items lying around (zinc nails anyone? :)), it just goes to show you what migh