All the patterns from www.subtlepatterns.com - including the famous Photoshop .pat file
If you need Base64 versions of the patterns you can use this generator: http://www.greywyvern.com/code/php/binary2base64
Subtle Patterns is created and curated by Atle Mo. The original author of the patterns are credited on subtlepatterns.com
The work is licensed under a Creative Commons Attribution 3.0 Unported License. The patterns can be used freely in both personal and commercial projects with no attribution required, but always appreciated.