View all the patterns from Subtle Patterns - 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.
The original authors of the patterns are credited on Subtle Patterns. Subtle Patterns is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License. The patterns here can be used free of charge, but please read this before using them: CC BY-SA 3.0.