Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
Black And White Floral Pattern Background from PDP.
Source GDJ
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Psychedelic Geometric Background No Black
Source GDJ
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
A version without colours blended together to give a different look.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Source Firkin
A dark metal plate with an embossed grid pattern and a bit of rust. Here's a dark metal plate texture for use as a tiled background on web pages.
Source V. Hartikainen
Inspired by this, I came up with this pattern. Madness!
Source Atle Mo
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen