Several people have asked me to do a tutorial but I thought it would be easier for you to download the psd file and see it for yourself! I basically use the same style over and over again, just rotate the textures, change colors, cropping, etc.
Check my resources for these textures, I don't know for sure who made them (if you recognize your texture let me know and I'll credit you here). I hope it's helpful! :)
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download here *
some examples:
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