With the Barry M Version, I opted for the black crackle effect. It was really easy to apply and it went on just like normal nail polish and within a few seconds the crackle started appearing. Very good value for money at £3.99. The Boots in my area had other colours incl White, blue and pink.
I then came across Nails Inc's version, but in a gold glitter colour. Bit more expensive, actually a lot more at £11.00. I didn't find this one as easy as the Barry M one and the crackle effect wasn't as great as the Barry M. They have recommended painting in other directions, so will give that a go. I have to admit I do prefer the Barry M one, but maybe the Nails Inc will grow on me.
A lot of people have commented and even thought I got them done in a Nail Parlour! SO if you haven't tried them before, definitely worth a go