Infact I have just cheated right now - this thread reminded me to sort it. I have used Snapfsh and order a pack of 20 photocards. On front it is a photo of DD at piano (as said before). Next to it a messgae saying Thank you for my Christmas resent. Reverse is blank so DD can add personalised message herself.
£7.99 for 20 inc envelope, but currently 25% off with code HAPPYCARD