OMG - OPI!

You'd think the internet would be the last place you'd look for a nail colour but alas OPI have come up trumps with their 'Try It On' feature...

Basically you can change the skin tone and nail length of the hand on their site and then show it wearing any of the nail colours they make. Even if you don't want to buy anything, you'll be compelled to keep trying different combinations (it caused a clicking frenzy in my office one afternoon!). PLUS if you want to get all technical about it - there is a downloadable app!

Of course the colours are not exactly as they would be in real life on your real hands but it's pretty damn close and even the varnish addict who showed me this feature uses it before she buys!
Hat's off to OPI for coming up with this fresh take on nail varnish. The rest of the site is very informative too and their products aren't too bad either ;-)