A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Seamless Green Tile Background
Source V. Hartikainen
Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Almost like little fish shells, or dragon skin.
Source Graphiste
This background texture resembles stone. It may be used as a background on web pages or on some of their html elements (header, borders, menu bar, etc.). Just modify it for your needs.
Source V. Hartikainen
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
Sort of like the back of a wooden board. Light, subtle, and stylish, just the way we like it!
Source Nikolalek
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
There are many carbon patterns, but this one is tiny.
Source Designova
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
I asked Gjermund if he could make a pattern for us – result!
Source Gjermund Gustavsen
Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin