So, I absolutely wanted to make my own! And of course I also wanted to use my own pattern, not just anything!
Looking into one of the instructables (How-to-Fold-a-Book-into-a-Word-The-original-tuto ), which describes the process of making your own pattern, I saw that the measuring and mapping from picture to page is a really tedious, time-consuming process, which can also go wrong in many places. And I realized that the number of free ready-to-fold patterns is a bit, .... mmmh, limited - you don't always want hearts...unless it's Valentine's day, of course.
As I'm also learning how to program, and am a fan of open source software, I thought I could combine this with the books to create something useful.
So I wrote a program which can turn your picture into a pattern for making book folding art.
This instructable is not about how to write that program, nor will I explain in detail how it works.
This instructable shows you how to use the program to make your own book art with your own pattern.
WARNING: The program was only tested on Linux. I do not know, nor can I test, if it also runs on a Windows or Mac OS operating system. If you find out if / how it works on those other, non-open source operating systems, please provide a hint in the comments for other users!
Update: Instructables user flogy4031 and I got it to work on Windows 7. flogy installed WAMP (from WAMP.org), a server environment for Windows, which did some of the configuration of php for him, and imagemagick. Then flogy still had to do some configuration to make the command line work (see linked videos in the comment section). I have now added a Windows version of the script to the github repository, which eliminates a problem caused by different behaviour of the Windows command line.
Thank you very much, flogy4031!
Update 2: As the configuration of php and imagemagick seems quite difficult on Windows for the non-geeks, I added the option to use a virtual machine (which is a little computer inside you computer, if you will). I think this is much easier for the Windows users, and it will also work on Mac OS/X. However, the download size is bigger. Go straight to option 2, if you prefer this!