Let's make your own pattern. It's easy and simple. I use Adobe Photoshop CS6, but I think it also works with lower version of Photoshop.
Open Adobe Photoshop CS6, click File and then click New. Width: 85 px, Height: 200 px.
I name it "01", click OK. To make a new pattern, you can customize the color and/or add more triangle. After you make a lot of tribal pattern, save the pattern to .PAT format. Click Paint Bucket Tool.
Taraaaaa, you just make .PAT file by your self!
In some cases, if you cannot find the location of the .PAT file you made, repeat the last step; click Paint Bucket tool, change to "Patterns" click Save Patterns... (see the picture above).
There is your .PAT file "Tribal by Your Name Here", right click the file and click Cut.
You can also place it in a New Folder for .PAT files that you made.
If you want to see the preview of your pattern in large image, make a new document in Adobe Photoshop.
Here is my result.
|Actually I don't really like the result.|
|Same layout but different color. This is better than the first one.|
|Some triangle added. Looks more stunning.|