Last year, DD was 3 months old. We put her in herChristmas dress, and draped a white blanket over carseat. We put her in it in front of the tree with the lights on. She had a little Santa hat, too. I tried to get one of her smiling, and my best shot ended up being her with drool all over her chin, little bubbles, the works. So, I put the words "I'm Drooling of a White Christmas" in the space over her right shoulder and we sent that out. It ended up really cute, and we got lots of compliments on it.
I also tried getting picturesof her wrapped up in Christmas tree lights, but she was just too little to really play with thm or look at them in wonder.
I think this year, I'm going to cut out the word J-O-Y from heavy white cardstock and put her in her (a yet unpurchased) Christmas dress on a black background and have three photos of her side by side, each with one of the letters spelling out joy.