First of all I had the idea of using the front cover as a window which would somehow open up to show the sky behind it. However, this proved to be quite difficult because since the book only contains 6 pages without back and front it would be wasting two pages of the book. Also I found it difficult to open up the window itself.
I then had the idea of using each page as a letter to spell out blue but with block letters so that not much of each page had to be cut out. I tried this out but decided it may be too obvious and take the attention away from the sky theme. B