Nintendo UK has announced that a free Happy Winter Holidays 3DS HOME Menu theme is now available at GAME.
The promotion will run at the specialist retailer until 7th January 2016, and simply requires you to visit your nearby store and connect to the Nintendo Zone service.
The theme stars Nintendo icon Mario in a christmas wreath, with snowflakes scattered around and a snowman of the Italian plumber on the touch screen. It is unclear what music or sound effects accompany the theme.
— Nintendo UK (@NintendoUK) December 4, 2015