The templates here can be downloaded and used to make your own jerseys, and even have them added to the database for use with the widgets. They are available in 3 different formats: Photoshop, Illustrator and SVG. (SVG is an open source vector format, if you have any problems opening this type of file using Inkscape and other free programs let me know.)
The Photoshop file should be compatible with all CS versions of the program. The Illustrator files are available in all 3 versions and I recommend using the one for the version you use. These templates were created using Illustrator and you will probably get the best results if you have access to it. However, Photoshop will work just as well in most cases.
All of the different layers, masks, etc are included and are labeled. I will eventually post some tutorials and example files that will better explain how to get the different effects and how the jerseys take form.
I place no limitations on the use of these files, however I do ask that you do not redistribute them. Please refer people to this particular page for the downloads as well as the name of the site. Also, if you make jerseys that aren't in the database consider submitting them.
Links to help you in the creation process can be found on the Links page here
There is also a forum on the site here, where you'll be able to get help as well as post samples and get additional templates and examples.