Altered Art Inspiration

I am working on another chunky book page.  Actually I should be finished with it, but I am very behind at the moment.  I have had a hard time getting going on this one for some reason.  Usually chunky books are 4" x 4", but this one has slightly different dimensions--8" wide and 6" long.  The book is called "I Take Pen in Hand", and it is meant to be in the vein of the Griffin & Sabine books by Nick Bantock.  We need to have the front of the page collaged in some way, and on the back will be an envelope of some sort with a letter which tells the story on the front of the page.  I have had a variety of ideas, but nothing has really inspired me enough to get me working on it.  Whenever I need inspiration, of course I always turn to a book (that is where I can always find some sort of an answer or inspiration).  This book, Altered Art by Terry Taylor has some really great examples in it.  I have also pulled out a book of women's letters, 800 Years of Women's Letters by Olga Kenyon to browse through and see if reading real corresondence sparks some ideas.  I had thought of taking some of Josephine's actual letters to Napoleon and creating my art around that idea.  I have a book of clip art, which has some color drawings of the two, but I am not sure...I had also thought of doing a sort of travel letter, which would be fun to illustrate.  I could put Airmail envelopes on the back, but incredibly I have not been able to find normal size Airmail envelopes.  I guess actual written correspondence is dead, eh?!  Anyway, I had hoped to at least get out my box of images and start there and see what pops out at me!