If you're really serious about a White Christmas, this is how you do about it. Over at Instructables, user MakeSnow has a step-by-step guide to building your own backyard snow machine that will cover your lawn in fresh fluffy white stuff anytime the weather is cold enough to keep it from melting on impact. All you need is just over $100 in your pocket when you visit the hardware store, and the time to put it all together. More »