Nokia no doubt won over a few undecided minds last month when it ran a promotion gifting new members to the Lumia 710 owners club with a colorful cover of their choice. We assume it was successful, because it's back. Yes, for the month of April, US-based adopters -- both new and old -- of the mid-level Nokia phone can claim a free chromatic cover. All you have to do is visit the source link below and punch in a few details, Nokia will then ship it out free of charge. We're not trying to influence you, of course, but the Engadget blue one looks pretty good.