Grand sport stripes, tinted windows, carbon fiber splitter, Z06 spoiler, new wheels, chrome accents (but not too much), cargo area cover, LED tail light conversion.
Check out RPI, MidAmerica, Ecklers, Corvette Central, Corvette America, Zip's. They all have lots of accessories for your car. Also, dealers sell the stuff, but usually, their prices are a lot higher.
Also have 2012 GS. Supersonic Blue.