Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Background formed from the original with an emboss effect
Source GDJ
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Seamless pattern the basic tile for which can be had 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
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Remixed from an image that was uploaded to Pixabay by CatherineClennan
Source Firkin
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
The name Paisley reminds me of an old British servant. That’s just me.
Source Swetha
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso
A repeating graphic with ancient pattern. I came up with this name/title at last minute, so you may find that there is very little of ancientness in this pattern after all.
Source V. Hartikainen
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Here's a new gray "fabric" pattern. Use it as backgrounds for websites or for other purposes.
Source V. Hartikainen
Prismatic Polka Dots Mark II 3 No Background
Source GDJ