A seamless web texture of "green stone".
Source V. Hartikainen
There are many carbon patterns, but this one is tiny.
Source Designova
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
A free seamless background texture that looks like a brown stone wall.
Source V. Hartikainen
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Pattern produced in Paint.net using the Vibrato plug-in.
Source Firkin
From a drawing in 'A Rolling Stone. A tale of wrongs and revenge', John Hartley, 1878.
Source Firkin
A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.
Source Firkin
Prismatic Abstract Geometric Background 4
Source GDJ
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
8 by 8 pixels, and just what the title says.
Source pixilated
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
A free light orange brown wallpaper with vertical stripes designed for use as a tiled background on websites. An yet another background pattern with vertical stripes.
Source V. Hartikainen
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Here's a quite bright pink background pattern for use on websites. It doesn't look like a real fur, but it definitely resembles one.
Source V. Hartikainen
A seamless design of flowers remixed from a jpg on Pixabay by Prawny.
Source Firkin
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
A black tile-able background with paper-like texture.
Source V. Hartikainen