BambooAlthough bamboo looks like wood, it's actually a grass. So you might be surprised at how durable bamboo flooring can be. Its density allows it to stand up to busy spaces and active lifestyles. It has become popular in recent years not only for its sturdiness, but also for its affordability relative to hardwood and for its subtle, variegated appearance. Pros: Bamboo grows so quickly that it's considered a sustainable choice for green building. It's low maintenance, requiring no special care, and springier underfoot than wood. And it lends a touch of worldly style without the expense of a tropical or other exotic hardwood. Cons: The range of color choices is narrower than with traditional woods. It isn't as moisture resistant as many other materials — in high-humidity climates or spaces, it can warp. Much of the bamboo on the market is imported from countries that may have less stringent quality regulations than in the United States, so it's important to research sources.Cost: About $4 to $9 per square foot, uninstalled.More: Ecofriendly Kitchen Flooring5 Innovative Wood FloorsAn Introduction to Solid Plank Wood FloorsWhen to Use Engineered Wood FloorsLaminate Floors: Get the Look of Wood (and More) for Less