Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
A free background pattern with abstract green tiles.
Source V. Hartikainen
Prismatic Groovy Concentric Background 2
Source GDJ
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
A seamless web texture with illustration of pale color stains on canvas.
Source V. Hartikainen
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
8 by 8 pixels, and just what the title says.
Source pixilated
A blue gray fabric-like texture for websites. An yet another fabric-like texture. It has subtle vertical and diagonal stripes to it.
Source V. Hartikainen
Zero CC Mossy stone tileable texture, photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Hyde Park from Domesday-Book to date', John Ashton, 1896.
Source Firkin
Prismatic Geometric Pattern Background No Black
Source GDJ
Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
Background Wall, Art Abstract, Star Well & CC0 texture.
Source Ractapopulous
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Sort of like the Photoshop transparent background, but better!
Source Alex Parker