A 2012 trend in glasses is gradient colorization of plastic/composite frames. Traditionally, these types of glasses have been solid or tortoise shell. All the major designers are adding gradientized eyewear to their collections, both for men and women. Some casual browsing at the discount sites turned up relatively little, so stick with the designers at this point or wait until some of the new designs are copied or reinterpreted by the major discounters.  (Purchased online, a designer pair usually works out to around $250-$300. A typical non-designer pair from a discounter is typically around $100.)

Burberry. About $300 with lenses, online (unisex).

Miu Miu sunglasses. About $135 online.