A seamless pattern of dark bricks. Maybe it's not very realistic, but it looks good in my opinion.
Source V. Hartikainen
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
Remixed from a vector adapted from a jpg on Pixabay. The tile this is constructed from can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-yellow.
Source Yamachem
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
A pale yellow background pattern with vertical stripes. The stripes are partially faded. I think this background image turned out pretty well, especially those faded stripes.
Source V. Hartikainen
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
This beige background pattern resembles a concrete wall with engravings or something similar to it.
Source V. Hartikainen
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
From a drawing in 'An Old Maid's Love. A Dutch tale told in English', Maarten Maartens, 1891.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A seamless pattern formed from a tile made from page ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A dark gray, sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
Zero CC bark from fur tree tileable texture, photographed and made by me. CC0
Source Sojan Janso
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
Prismatic Abstract Background Design
Source GDJ
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Fake or not, it’s quite luxurious.
Source Factorio.us Collective