8 by 8 pixels, and just what the title says.
Source pixilated
Prismatic Groovy Concentric Background
Source GDJ
Background pattern originally a PNG drawn in Paint.net
Source Firkin
A white version of the very popular linen pattern.
Source Ant Ekşiler
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Adapted from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
The image is a seamless pattern which is derived from a vine .Consequently, the vine got like dots via vectorization.The original vine is here:jp.pinterest.com/pin/500744052301410188/
Source Yamachem
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
There are many carbon patterns, but this one is tiny.
Source Designova
Remixed from a drawing in 'Analecta Eboracensia', Thomas Widdrington, 1897.
Source Firkin
A seamless pattern based on a tile that can be achieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
A white version of the very popular linen pattern.
Source Ant Ekşiler
A tile-able background for websites with paper-like texture and a grid pattern layered on top of it.
Source V. Hartikainen
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
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
Never out of fashion and so much hotter than the 45º everyone knows, here is a sweet 60º line pattern.
Source Atle Mo
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry