Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
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
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A version without colours blended together to give a different look.
Source Firkin
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
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
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Groovy Concentric Background
Source GDJ
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Derived from a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin