Today we have a free high res texture pack from Caleb Kimbrough. It includes 8 light grunge textures that can be used for your personal or commercial projects, no attribution required. The only restriction is that you cannot sell or re-distribute them as your own. You can download the textures from the set on Flickr and take whichever images you want.
The texture pack includes the four images shown above, plus four others.
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For more textures, see our other free texture packs: