The image gl-seamless-pebbled-flagstone.jpg below is in the Public Domain. I improved the image quality and put it back in the Public Domain. It is free for any commercial or private use.
You can right click the image above and save it to your computer.
This is a seamless pebbled flagstone texture, which is often used for sidewalks, walkways and patios. I got this PD texture from here, I made it seamless and put it back in the Public Domain, you are free to use it in your private or commercial projects.
File Name: gl-seamless-pebbled-flagstone.jpg
Image Dimension: 512 x 512 pixels
File Type: JPEG (85% quality)
File Size: 130 KB
Original Author: Titus Tscharntke
Samples of the render results: