This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A free background tile with a pattern of pink bump dots. This background tile is sweet! Moreover, it's designed for use as website backgrounds.
Source V. Hartikainen
You know you love wood patterns, so here’s one more.
Source Richard Tabor
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
Old China with a modern twist, take two.
Source Adam Charlts
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Prismatic Abstract Background Design
Source GDJ