The letters are available as prints on Paul Thurlby's website and they are really lovely. The only problem would be which one to choose. So I bought an extra copy of the book and badgered my husband until he bought some mdf, cut it to size, wallpaper pasted the pages onto it and nailed the results to the wall of our boys bedroom. This is how it turned out. I've sat by their beds whilst waiting for them to fall asleep manys the night, and gazed at it all, and can honestly say I will never get sick of looking at it.
P.S. Earlier this year Paul Thurlby's Wildlife was published. I've had a look on Amazon and it looks great.