A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Seamless Green Tile Background
Source V. Hartikainen
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
From a drawing in 'Hundert Jahre in Wort und Bild', S. Stefan, 1899.
Source Firkin
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
Fix side and a seamless pattern formed from circles.
Source SliverKnight
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec