Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
A seamless background pattern with a texture of wood planks. This wood background pattern has vertically arranged planks. You may try to rotate it 90°, to see how it will look like when the wood planks are arranged horizontally.
Source V. Hartikainen
Dark blue concrete wall with some small dust spots.
Source Atle Mo
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
Remixed from a drawing in 'Очерки Русской Исторіи въ памятникахъ быта', Petr Polevoi, 1879.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A seamless pattern based on a rectangular tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
I have no idea how to describe this one, but it’s light and delicate.
Source JBasoo
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
I’m not going to lie – if you submit something with the words Norwegian and Rose in it, it’s likely I’ll publish it.
Source Fredrik Scheide
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel