Being a clueless Aunt, I corresponded with the very helpful Soma at Whims and Fancies who set me on the right path. I have been doing quite a bit of paper piecing lately as part of the T-Shirt Quilt finish, so I had some momentum. Right after Christmas I started on these blocks.
What to do with two paper pieced Dr. Who blocks? Make a book bag of course.
For her sister I just had to use some chalkboard fabric (sorry, did not get a picture of the table runner I made with this material) to make her a book bag: