I'm always on the hunt for dark polishes that don't look black & at the moment I've a little weakness for dark blues with an extra oomph.
Sephora by OPI "Go My Own Way" (from their Fall 2010 collection) fits perfectly into this category:
It falls somewhere between dark blue & dark teal & has a dusty quality to it. There are also blue shimmer particles, but they only show up at certain angles.
The polish has an almost metallic finish, but is surprisingly unstreaky *yay*! There's nothing worse than a streaky metallic finish, right?
I did 2 coats to achieve complete opacity. Drying time was a little longer than usual (even with Seche Vite), but after about 20 minutes the polish had dried completely.
Barielle "Blackened Bleu" (from the All Lacquered Up Fall 2009 collection) is another beautiful polish that fits into the same category:
It has a black base with tons of teal microglitter that really show up on the nail. It's uber-sparkly & even though the base color is rather sheer, it takes only 2 coats to get opaque. Gotta love it :-)