After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
Prismatic Abstract Geometric Background 5
Source GDJ
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
From drawing in 'Musings in Maoriland', Thomas Bracken, 1890.
Source Firkin
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
A pattern derived from part of a fractal rendering in Paint.net.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
A repeating background of beige paper with vintage look. Repeats to infinity, as usual.
Source V. Hartikainen
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
An abstract Background pattern of purple twisty patterns.
Source TikiGiki
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
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