A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
A background pattern with blue on white vertical stripes.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
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
A simple bump filter made upon request at irc #inkscape at freenode. Made a screen capture of the making here: https://youtu.be/TGAWYKVLxQw
Source Lazur URH
A background pattern with green vertical stripes. A new striped background pattern. This time a green one.
Source V. Hartikainen
Sometimes you just need the simplest thing.
Source Fabricio
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
The base gradient edited so now more details are rendered.
Source Lazur URH
A seamless texture of a rough concrete surface.
Source V. Hartikainen
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous