Monochrome hounds dog tooth nails ftw! Doing these was super easy, a matter of buying the false nails, hounds dog tooth stickers, cutting to size, any black nail varnish a top coat, simples (links in bold below).
The false nails I though I'd be frugal and get a big lot and it only works out a measly 9p per spine of 10 nails (please note, they're nail sizes 0, 2, 4, 6 and 8)!
The hounds dog tooth comes with 12 strips, 6 white and 6 black and roughly one line will do two nails (depending if you use them horizonal or vertical). Another barg just 99p per sheet.
I decided to use a matt top coat, I'm obsessed with this effect atm. I got mine from elf and it costs £2.50 it's currently out of stock tho. Found an alternative on ebay for £1.62 not sure if it's just as good but for such a low price it's worth the punt.