The same is true of architecture, for the most part. Environmental sustainability often produces no major visible effects. Caulk and insulation are pretty much invisible, for example, and water- and energy-saving fixtures and appliances are often indistinguishable from their guzzlin' cousins.
What should sustainability look like? Is there an innately sustainable aesthetic?
In the meantime, though, be sure to include a 220V outlet to recharge your car.