Over the last couple of days, celebrities have been popping up at Fashion Week and the 2009 Toronto Film Festival with more than a love of cool clothing or a movie premiere in common. From Rachel Bilson to Drew Barrymore, blue and blue-green nails are everywhere. I love that these traditionally warmer-weather shades are making the seasonal transition, and the range of fashionable colors means there are flattering colors and depths of tones for practically every skin tone. From sky blue to bright turquoise, why not go under the sea with this trend? I put together a widget with some of the cutest marine colors around. Click through and dive right in.