A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
Prismatic Abstract Background Design No Black
Source GDJ
This is a grid, only it’s noisy. You know. Reminds you of those printed grids you draw on.
Source Vectorpile
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
CC0 and seamless wellington boot pattern.
Source SliverKnight
Original seamless pattern with an Inkscape filter.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
There are many carbon patterns, but this one is tiny.
Source Designova
Subtle scratches on a light gray background.
Source Andrey Ovcharov