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
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
This is the remix of an OCAL clipart called "Rain on Window" uploaded by "pagarmidna".Thanks.This is a seamless pattern of raindrops.
Source Yamachem
Inspired by an image that was uploaded to Pixabay by geralt
Source Firkin
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Zero CC tileable Laminate wood texture, photographed and made by me. CC0
Source Sojan Janso
8 by 8 pixels, and just what the title says.
Source pixilated
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
A seamless background of warped stripes on paper.
Source V. Hartikainen
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Alternative colour scheme for the original floral pattern.
Source Firkin
Can’t believe we don’t have this in the collection already! Slick woven pattern with crisp details.
Source Max Rudberg
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
8 by 8 pixels, and just what the title says.
Source pixilated
A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen
Pattern produced in Paint.net using the Vibrato plug-in.
Source Firkin
Retro Circles Background 7 No Black
Source GDJ
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim