This is a pattern for gimp.
To install the pattern, click the "Download File" button on the right side of this page and put the .pat file in your gimp patterns folder. In Windows (I'm using Vista) the path for this folder should be something like C:\Users\Username\.gimp-2.6\patterns. If you can't find the folder, go to Edit>Preferences (in gimp), press the "+" button to expand the "Folders" item in the list on the left, and click on "Patterns." The region on the right should then display the locations of all the folders that gimp will detect your patterns, so put it in one of those folders.
Restart gimp or refresh your patterns to make it appear.
Check out my tutorial if you want to learn how to make this pattern for yourself: [link]