Nokia has kicked off 2013 with a new challenge where two selected winners will bag a pair of Purity HD headphones by Monster. Sounds tempting, right? All that's required is for owners of new Lumia Windows Phones to match the colour of their device with an object or surrounding and snap a photo. They emphasise the cooler, more out there, the better. A few examples were provided by the team to get the idea engine started (see above).