I would like to share a little secret; over here you get access to hundreds (thousands?) of royalty free, HQ textures. These are used by industry professionals, and have been used in games like Killzone.
It’s a shame if you don’t know about cgtextures
It really is. I suppose that is why this is a good thread 
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I am amazed noone else has posted it before… we all know about it 
Hooray for cgtextures!
I didn’t really know about this before, thanks for sharing =O
Same here - thanks for the link!
Been using it for years now 
It’s getting to the point that I recognise textures from CGTextures.com in games - Silent Hill shattered Memories for example.
Hey guys, did you know about this cool forum called forum.unity3d.com??!
just kidding, nice website and has a lot of good textures. Thanks for sharing even though most of the people already know about it. 
Just be warned, their license pretty much prohibits using the textures for assets you might want to sell on the Asset Store.
Otherwise, terrific source.
A few more, because you can never have too many texture resources…
http://www.burningwell.org/gallery2/v/textures/
http://www.plaintextures.com/
http://www.3dmd.net/gallery/index-2.html
@loken Cgtextures allows you to use their textures on assets.
And I think they also require a mention in your readme/license agreement document. Read more at their license agreement page.
nice did not know about these
So are they completely free?
As long as you follow the conditions of use!
Yay for altruism!
Also, please feel free to post more “links everyone already knows about,” since I’m just getting started and didn’t know about this one!
What he said
Well, shoot. I may have been thinking of some other resource site. Thanks for updating me on that one!