Here is another:
They limit you to 20 downloads a day but that shouldn't be a major problem, just be selective at first: http://mayang.com/textures/index.htm
Here's what they say about License:License
These textures are Copyright © Mayang Murni Adnin, 2001-2012. They have all been taken by our own cameras or created by ourselves.
They are free to use for all uses, whether commercial or non-commercial (you may incorporate them into your derived work with no requirement to pay us any licensing fee etc). Your derived work must involve significant modification to the textures. It would be nice if you could credit us.
You may not sell any of these textures in an unmodified form, or any derived works where the product you are selling is still a texture and is likely to compete with this website.
You may redistribute (give/send to somebody else/display on a web site) up to 30 of these textures together, but no more. You must credit this website as the original source (tell them about us).
Based on that, I think it's OK to use them anywhere. If you want all of them, they would like you to buy them which seems pretty reasonable for really high res, good quality textures.