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This is a seamless asphalt concrete texture (asphalt mixed with mineral aggregate), which is often used for road surfaces and parking lots. I got this PD texture from here, I made it seamless and put it back in Public Domain, you are free to use it in your private or commercial projects.
File Name: gl-seamless-asphalt-concrete.jpg
Image Dimension: 512 x 512 pixels
File Type: JPEG (85% quality)
File Size: 142 KB
Original Author: John Harvey