Now that I've gotten over the shock of Naya Rivera's new blond hair and had time to more carefully analyze all the film from last night's People's Choice Awards, I've identified three major nail trends that appear to be happening right now in celebrity land. 1. Metallic nail polish Sarah Michelle Gellar was one of many to opt for metallic and/or glitter nail polish, in an interesting return to shiny-shiny manicures. Some, like Sarah Bareilles, added an accent nail (that trend seems to be…