I found this awesome book at a cool toy store and it was a big hit! I think it helped that my kids personalized it! I had them each pick their favorite color to write with and write a note to Grandma.
Then they each flipped through the book and found things they do special with their Grandma and made comments and funny notes all through the book. It turned out really cute and personalizing it made it really special! She loved it! They also make a Grandpa one, in case your interested.