And this last thing was done in an excellent way by British design corporation LulaDot. This is the CAPtivate Lamp.
The entity has been made out of, indeed, bottle caps. But there's more.
The lamp is available online through LulaDot's website. For a mere 115 GBP it's yours (roughly that's $207). But when you get the lamp all the tops aren't screwed on the lamp. LulaDot gives you about 40 tops to screw on but the rest you'll have to collect yourself. And here comes the great part, the color of the tops creates the color that the light will have.
For example, if you screw on a load of orange Fanta tops the light will become orange. If you choose for Coca-Cola-red the light will become red, and so on.
The great part is that the end user determines how the product looks and can customize it in unlimited ways.