Last week I decided to go dark on my nails, using the Jack Wills Nail Varnish in (creatively called) "Navy". The shade is beautiful, although, not a true deep blue - it's almost on the verge of green once applied.
A generous 2 coats (3 for some nails) were needed, and it was disappointing that it only lastly around 3 days before chipping was visible.
Nevertheless, I enjoyed using it and appreciated the change on my nails. Who says bright shades must be painted on our nails in Summer? Not me.