Having a lawn is great, but if you live in a big city the chances of that happening are slim to none. But what about those rich types who have gardens and lawns and all that business on their roof? Well, the luxury of having a lawn on your roof may be getting a lot more affordable thanks to Toyota Roof Garden of Japan, a division of the automaker. They've developed grass mats that come in 20-inch squares specially designed to go on your roof. They're slow growth, which means they only need to be cut once a year, and they have built-in irrigation holes so watering them is a snap. Simply lay out the squares how you want and voila, you've got a lawn. In addition to looking nice, having a lawn on your roof provides insulation, which should cut down on your energy costs. They're selling the roof grass for about $43 for every 10 square feet — pretty reasonable when you consider how easy it is to put in and maintain. — Adam Frucci

Toyota Roof Garden, via Pink Tentacle