Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
Classic vertical lines, in all its subtlety.
Source Cody L
A seamless texture of worn out "cardboard".
Source V. Hartikainen
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
He influenced us all. “Don’t be sad because it’s over. Smile because it happened.”
Source Atle Mo
A seamless texture of a rough concrete surface.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
You may use it as is, or modify it as you like.
Source V. Hartikainen
A background pattern with blue on white vertical stripes.
Source V. Hartikainen
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
Here's a dark background pattern that contains a steel grid pattern as a texture. Use it as a website background or for other purposes. It's free!
Source V. Hartikainen
A seamless pattern drawn originally in Paint.net by distorting a slice of background pattern 116 and copying the resulting triangle numerous times.
Source Firkin
Zero CC bark from fur tree tileable texture, photographed and made by me. CC0
Source Sojan Janso
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman