A letter from Santa! Its free, easy and quick (sounds like me?!) . Just choose a design and enter childs name, age, gender and an email address to send Santa's letter to. There's probably other free better ones out there but this was the first decent one I found.
I however have been an exceptionally good boy this year so I don't need to print my own off as I will be getting a real reply off the fat jolly man any time now, it is however ideal for my kids as they've been a little b*a*d* all year