I'm a huge fan of metallic nailpolish ... oh, especially bright or dark purple's & dark blues
Revlon has a great range of new metallic/dark shades... apparently this season the big trend is for 'gothic' hues (lololol, every winter the soft-goth thing comes out, I love it because I can stock up on clothes without spending a fortune buying from specialist retailers overseas!), so dark blues, blacks, browns, jewel tones (blood red, dark purple, forest green etc) and metallics are everywhere