Cycloid Linear Drive - great idea that is often quieter than a linear drive, but it may suffer from tolerances and backlash more than other designs.
How To Build A Glass Bottle Torch http://ideas2live4.com/nyip This DIY project is like hitting not two, but three birds with one stone. You get to decorate your patio with your empty wine bottles, instead of it just binning them. The torches can also be used to keep mosquitoes away. And last but not the least, you get to save some money by recycling!