I saw this gradient on Pinterest a couple weeks ago and absolutely fell in love with it. I loved the dark vampy look of the black tips against the blood red. The pin originated from http://www.lovevarnish.com/2012/06/vampy-gradient.html so credit goes to her for this awesomesauce mani.
This is 2 coats of Sally Hansen Right Said Red sponged with a combination of Sally Hansen Wine Not and Wet N Wild Black Creme. Then I added just a teeny bit of sponging on the black tips with Orly Androgynie.
This is a mani I can sink my teeth into. I'd stake my life on it.
Hope you have a great day!