Teragren's 6x6 plank bamboo flooring can be glued, nailed, stapled, or floated on, above, or below grade. Formaldehyde-free adhesives and a water-based coating help the highly renewable, 100 percent bamboo layers maintain their environmental advantage. According to the company, the 6-inch-wide-by-6-foot-long plank is harder than oak and more dimensionally sound than maple. Natural and caramelized colors in either vertical or flat grain finishes are available. Teragren, 800.929.6333; www.teragren.com.