An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
The original enhanced with some gradients.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Feel free to use this seamless background texture as a background on a web site. It's colored in a light pink color and is seamlessly tile-able.
Source V. Hartikainen
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Colour version of the original pattern.
Source Firkin
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen