I think they look really good on you. I also just bought a big pair of sunglasses - think Nicole Ritchie. She always has very large, almost "buggy" shades on, and they look good on her. I think she inspired me to buy mine.
Ok.. since we're talking about oversized sunglasses, I had to share mine cuz they're ridiculously humongous but I love 'em! Sorry my hair's a mess and I'm all shiny cuz I just got back from the gym..