Browsing the net I found this flickr account of a digital illustrator named Patrick Hoesly who has texture packs available for download and use under Attribution 2.0 Generic (CC BY 2.0). Several of the textures here are some that I already use but at a higher resolution. Here's the links, I hope you enjoy the find and have a use for it.

Top Rated Textures
All Texture Pack
B&W Alpha Texture Pack
Sky Texture Pack
Earth Texture Pack
Halloween Texture Pack
Texture Pack 1
Texture Pack 2
Texture Pack 3
Texture Pack 4
Texture Pack 5
Texture Pack 6
Texture Pack 7
Texture Pack 8
Texture Pack 9