This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
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
Prismatic Chevrons Pattern 5 With Background
Source GDJ
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
There are many carbon patterns, but this one is tiny.
Source Designova
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
The name is totally random, but hey, it sounds good.
Source Atle Mo
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin