A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Original seamless pattern with an Inkscape filter.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
Drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Prismatic Hexagonalism Pattern No Background
Source GDJ
Embossed lines and squares with subtle highlights.
Source Alex Parker
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Have you wondered about how it feels to be buried alive? Here is the pattern for it.
Source Hendrik Lammers
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
You know I love paper patterns. Here is one from Stephen. Say thank you!
Source Stephen Gilbert
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett