Under the hood
Windows 32 bit:
Program Files (x86)\Adobe\Adobe Photoshop CS6\Presets\Deco
Windows 64 bit:
Program Files\Adobe\Adobe Photoshop CS6 (64 Bit)\Presets\Deco
/Applications/Adobe Photoshop CS6/Presets/Deco
It is possible to create new patterns by defining new scripts and placing them into the directories above. The Deco script file acts as a pattern preset and when a new file is added to these directories, the name of the file appears in the Scripted Patterns pull-down menu and the pattern is ready to be used.
Where to get new patterns
There has been a vibrant community of users already at the pre-release forums. A few users created new scripts and some managed to cleverly combine regular Photoshop scripts with Deco scripts to extend the functionality of the feature. For example, Chuck Ubele created a Photoshop script that provides a rich menu of options for the shipped Deco script and one new script (see his website). Others then created beautiful patterns using these new scripts.
For now you can dowload new scripts at the end of this page or from the forum http://forums.adobe.com/community/photoshop/photoshop_scripting.
Once you dowload a script, place it to the directory listed above. The file needs to have the extension jsx. You may have to make the directory writeable to do be able to copy the file there. Depending on your version of Photoshop the new fill (with the same name as your script file) will appear in teh pull down menu for scripted fills either when you open the Fill panel or after you restart Photoshop.
Where to meet other users interested in scripted patterns
The topic related to Deco scripted patterns are discussed in the Photoshop Scripting forum: http://forums.adobe.com/community/photoshop/photoshop_scripting
How to create your own scripted patterns
You can download a documentation on writing your own Deco scripts below. Feel free to contact Radomír Měch or ask other users in the forum. Don’t forget to share your scripts or the resulting patterns! Have fun!