Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
This one has rusty dark brown texture.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
Original seamless pattern with an Inkscape filter.
Source Firkin
A seamless texture of a rough concrete surface.
Source V. Hartikainen
If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso
Remixed from a PNG that was uploaded to Pixabay by VictorianLady
Source Firkin
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
Almost like little fish shells, or dragon skin.
Source Graphiste
Abstract Tiled Background Extended 8
Source GDJ
Classic vertical lines, in all its subtlety.
Source Cody L
A repeating gloomy background image. This one consists of a pattern of black chains layered on top of a dark textured background.
Source V. Hartikainen