I've been keeping my eye on InterfaceFLOR for a few years, but I haven't had a place where their carpet-tile rugs would fit. Now I find myself with a decent space in NYC that could use a rug, and an outdoor terrace for which FLOR has just put out some slick new options.
Seeing Spots, shown above, is (the better) one of three outdoor tile designs that come in a handful of bright colors. Under $200 will cover a 5x7 space.
On the eco side of things, FLOR employs techniques that don't require or waste much energy, and also use recycled or renewable materials in many of their tiles.