Same classic 45-degree pattern, dark version.
Source Luke McDonald
There are many carbon patterns, but this one is tiny.
Source Designova
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
Looks like an old wall. I guess that’s it then?
Source Viahorizon
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I. Version with black background.
Source Firkin
A seamless web texture with illustration of pale color stains on canvas.
Source V. Hartikainen
This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Background formed from the original with an emboss effect.
Source Firkin
Remixed from a PNG that was uploaded to Pixabay by gingertea
Source Firkin
Prismatic Floral Background No Black
Source GDJ
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett