By Adam Bloodworth You’ve given out the presents, drunk the unreasonably early bubbles and exhausted all the family small talk – now it’s time to run off and have five minutes to yourself on Christmas Day. The Ghosts of Christmas Cards app is the most fun thing you’ll do all day – we promise. Download the app, take a photo of yourself and then choose a backdrop for your photo. You can choose the 60s, 70s, 80s or 90s and then the app will create a Christmas card with a version of your photo on an absolutely amazing period Christmas backdrop. Sometimes they’ll make you look morbidly obese and so…