A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
A bit of scratched up grayness. Always good.
Source Dmitry
Prismatic Groovy Concentric Background 3
Source GDJ
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Colour version of the original pattern inspired by the front cover of 'Old and New Paris', Henry Edwards, 1894.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A pattern drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
Pattern produced in Paint.net using the Vibrato plug-in.
Source Firkin
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß