Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
This could be a hippy vintage wallpaper.
Source Tileable Patterns
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
Source Firkin
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
The tile for this is based on a repeating unit close to a design on Pixabay. It can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
This yellow background consists of a pattern of glossy gold buttons arranged in polka dot style on a seamless texture. Here's a pale yellow background pattern. Feel free to use it for your needs!
Source V. Hartikainen
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
The name is totally random, but hey, it sounds good.
Source Atle Mo
Prismatic Chevrons Pattern 5 With Background
Source GDJ
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Prismatic Polyskelion Pattern No Background
Source GDJ
Traced from a drawing in 'Household Stories from the Collection of the Brothers Grimm', Wilhelm Carl Grimm , 1882.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
A white version of the very popular linen pattern.
Source Ant Ekşiler