Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
A free seamless background texture of "timber wall" (colored in dark brown).
Source V. Hartikainen
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
Zero CC tileable brick texture, photographed and made by me. CC0
Source Sojan Janso
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
Prismatic Chevrons Pattern 5 With Background
Source GDJ
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
Colour version of the original pattern.
Source Firkin
Prismatic Hypnotic Pattern No Background
Source GDJ
The original enhanced with one of Inkscapes's filters.
Source Firkin
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin