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! :)



* download here *

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And I finally made a tutorial , it took me very long. O___O
It takes me not more than 5 minutes to make an icon but to explain it how it was very hard! I use so many layers ... LOL But let's start.
Attention please: these tutorials are for colors only,it's up to you adding brushes/textures (I often use the sharpen and the smudge tool). Keep in mind every cap is different so again you may need to change the inputs/ouputs and the values in the selective colors . So these tutorail are basically a base. I hope it would be useful to you anyway ;)
ETA : Sounds like some steps were missed , my bad :( I tried to check but I still didnt' get the problem . So I'm uploadign here the PSD format so you can be sure they works.
tut#1|tut#2

Tutorial #1 ( for dark and soft colors)

from this to this

other examples

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Tutorial #2 (for vibrant and bright colors )

from this : to this

Other examples

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