How can I turn multiple .doc (word files) into a book?

I am trying to turn multiple word documents with different themes, pictures and background etc... into one book. When I have tried to compile them, I keep losing themes from individual files. This is not for a professional project or anything. I am basically putting letters together for a friend, and need it to appear somewhat like a book online. As well as printable. Also, if there is a free way to do it, that would be wonderful. I don't have any $ to invest in this, it is a series of letters I have collected for a sick friend.
Thanks!