20 Free Grunge Dirty Wall Textures call Aqueous Sun brings is amazing dirty textures pack It includes 20 free high resolution textures of the rust, You might have a ton of other rust images but the ones in this pack are huge!!! They are all around 4288px x 2848px (300ppi) and look stunningly crisp.

From: http://www.seodesign.us/textures/20-free-grunge-dirty-wall-textures/?sms_ss=pingfm&at_xt=4dc60c393ba408b9%2C0