A heavy hitter at 400x400px, but lovely still.
Source Breezi
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Abstract Tiled Background Extended 8
Source GDJ
The tile this is based on was adapted from an image that was uploaded to Pixabay by frolicsomepl. It can be had in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
The image a seamless pattern of a wire-mesh fence.I want you to use this pattern as a lower layer.
Source Yamachem
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Seamless Light Background Texture.
Source V. Hartikainen
Greyscale version of a pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
An abstract web texture of a polished blue stone (or does it look more like ice).
Source V. Hartikainen
This is the remix of "Colorful Floral Pattern Background 3" uploaded by "GDJ". Thanks.
Source Yamachem
Prismatic Geometric Tessellation Pattern 4 No Background
Source GDJ
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez