I would try an attic window quilt. With each window the size of your pictures. You could add fabric borders to the smaller pictures to bring it up to size. The borders could be the same fabric color as the out side of the small picture.
Some attic window ideas.
http://books.google.com/books?id=vVN...0sizes&f=false
Other ideas:
http://www.pinterest.com/pin/497999671266386071/
http://www.pinterest.com/pin/497999671266015751/
Last edited by barking-rabbit; 04-09-2014 at 07:13 AM.