A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
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
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
Here's a new paper-like background for free use on personal and commercial projects (this applies to all background patterns here).
Source V. Hartikainen
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Prismatic Curved Diamond Pattern No Background
Source GDJ
Abstract Tiled Background Extended 12
Source GDJ
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
This was submitted in a beige color, hence the name. Now it’s a gray paper pattern.
Source Konstantin Ivanov
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
A repeating background of beige paper with vintage look. Repeats to infinity, as usual.
Source V. Hartikainen
8 by 8 pixels, and just what the title says.
Source pixilated
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin