Call me old fashioned, but I think it is important to send a proper thank you for gifts, I don't go as far as the Japanese thing of calculating a third of the original gifts cost then sending a present back worth the third but a card will do nicely.
Now, I didn't want to force Ebi-kun to sit and write a massive pile of cards, no fun and it will turn into resentment so I came up with a plan.... using some of his new Ninjago Lego and using the business card holder idea as a base we made a stand to hold blank cards.
Then we cut out a pile of cards and Ebi-kun wrote little thank you's on each one, we popped it into the holder and took a photo. Once we had worked through the pile I loaded them onto the computer and cropped them to size and printed them onto postcards.
I wrote the addresses on the back and Ebi-kun wrote a message or drew a picture on each one, pretty painless and a lot more fun!
If you don't want to go through the hassle of making each card I photographed a blank one so you could print this out and write a message on the blank area. This image is low resolution so I recommend printing it form the Flickr image HERE. I sized it for a standard Japanese postcard so the image is 140mm x 90mm but you could resize it if your local postcards are a different size.