Not sure about Disney Gram, but last year before out trip I wrote to Disney(emailed) and asked if they could send some sort of a card to my Mom to get her excited about the trip> Last time she went to Disney was when it was just Magic Kingdom so she wasn't sure what to expect. They were great about it, they sent her a picture of Goofy and wrote on it " can't wait to see you" and I had it sent to her before the trip. She just loved it!!!!
And she loved the trip!