You guessed it – looks a bit like cloth.
Source Peax Webdesign
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
A seamless texture of a rough concrete surface.
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
Heavily remixed from a drawing in 'Barbara Leybourne; a story of eighty years ago', Sarah Hamer, 1889.
Source Firkin
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
A textured orange background pattern with vertical stripes.
Source V. Hartikainen
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
Prismatic Groovy Concentric Background
Source GDJ
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A repeating background of thick textured paper. Actually, it turned out to look like something between a paper and fabric.
Source V. Hartikainen
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Psychedelic Geometric Background No Black
Source GDJ
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
A free background tile with a pattern of pink bump dots. This background tile is sweet! Moreover, it's designed for use as website backgrounds.
Source V. Hartikainen
Might not be super subtle, but quite original in its form.
Source Alex Smith
CC0 and seamless wellington boot pattern.
Source SliverKnight