If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
A bit of scratched up grayness. Always good.
Source Dmitry
Zero CC tileable cork floor, photographed and made by me. CC0
Source Sojan Janso
A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen
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
The image depicts a seamless pattern made using a bird's face.
Source Yamachem
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
It’s big, it’s gradient—and it’s square.
Source Brankic1979
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
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
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
8 by 8 pixels, and just what the title says.
Source pixilated
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten