Even though it's (kind of) summer now, I fancied dark nails.
I used Collection 2000 Lasting Colour in '1 Liquorice" for the black base, Frontcover (unknown name) for the dark semi-sparkly middle section, and Rimmel Lasting Finish in '198 Azure' for the sparkly tips.
All were fairly cheap polishes and the whole thing lasted very well considering the polishes I used. I painted all nails two coats of black firstly, and to achieve the gradient effect, I used a soft make up sponge to pick up polish from a bit of card / plastic, and dabbed onto the desired area (for the middle colour). Allow to dry and repeat again only covering the tips of nails with a different shade. Then I finished with a nice coat of Seche Vite Dry Fast Top Coat which is the most amazing top coat I've ever come across in my life. If you don't have this then I demand you to buy it now! Please excuse the 'blob' on my ring finger that shows up clearly on the flash photos, I think it was a bubble.