This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
This ons is quite old school looking. Retro, even. I like it.
Source Arno Declercq
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This is a more minute version of "fishnet 01".The image depicts a seamless pattern of a fishnet with a plenty of fish.It may be a lucky charm for fishermen.
Source Yamachem
Black brick wall pattern. Brick your site up!
Source Alex Parker
The image a seamless pattern derived from a weed which I can't identify.The original weed image is from here:https://jp.pinterest.com/pin/500744052301423641/
Source Yamachem
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
The image depicts a pattern of regular hexagon.As I made to use it for myself,I want to others to use it.Speaking about the ratio of the image, height : width = 2 : √3(1.732...)Ridiculous to say,I realized later that this image is not honey comb pattern.I have to slide the second row.
Source Yamachem
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Zero CC tileable hard cover cells book texture, 4k, scanned and made by me. CC0
Source Sojan Janso
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić