SOLAR POWER, without all those panels. “Companies are creating solar tiles and shingles in colors and shapes that fit in, for example, with the terra cotta tile roofing popular in the Southwest, or with the gray shingles of coastal saltbox cottages.” As solar materials get better, we’ll see more of this. In fact, inexpensive and ubiquitous solar power is one of the promises of nanotechnology, but we may well get most of the way there without it.