A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
From an image on opengameart.org shared by rubberduck.
Source Firkin
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Can’t believe we don’t have this in the collection already! Slick woven pattern with crisp details.
Source Max Rudberg
Looks like an old rug or a computer chip.
Source Patutin Sergey
He influenced us all. “Don’t be sad because it’s over. Smile because it happened.”
Source Atle Mo
A seamless background colored in pale orange. It has a paper like texture with diagonal grid pattern.
Source V. Hartikainen
The image depicts polka dot seamless pattern.
Source Yamachem
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Tiny little flowers growing on your screen. Nice, huh?
Source Themes Tube
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
Can’t believe we don’t have this in the collection already! Slick woven pattern with crisp details.
Source Max Rudberg
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Inspired by a pattern I saw in a 19th century book. This seamless pattern was created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
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
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen