Quite a while ago, I converted my base Dominion box into a storage solution for the base game + 3 expansions plus extra materials. In the process, I wrote a Python script (get the source here) to generate pdfs of the dividers that I used. I then published those pdfs to BoardGameGeek and since then have improved them due to feedback numerous times. However, people keep putting in requests for special versions (with cropmarks, for different sets, etc.) and the file I publish keeps getting bigger and bigger due to including all version. So, instead of growing the number of versions, I've decided to try putting the script behind the web form on the left so those interested can generate their own versions. Others have also taken my source and changed it if you are looking for different things.
Please note issues and requests on github, talk to fellow users in this thread, or contact me via BGG mail. You can also thumb the thread or the original file thread if you like these dividers, or even better post pictures of how you used them - I'm always curious.
If you would like to contribute, the code for the generator is available on github. A huge thank you to all the people who have contributed to this, especially wvoigt (bgg/github) and nickv2002 (bgg/github) without whom I would have no chance to stay up-to-date with this project.