This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Remixed from an image that was uploaded to Pixabay by CatherineClennan
Source Firkin
A repeatable image with dark background and metal grid pattern.
Source V. Hartikainen
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Abstract Ellipses Background Grayscale
Source GDJ
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
A seamless texture of worn out "cardboard".
Source V. Hartikainen
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
Might not be super subtle, but quite original in its form.
Source Alex Smith
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
The following repeating website background is colored in a blue gray color and resembles a concrete wall or something similar to it.
Source V. Hartikainen
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten