The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
Green Web Background, Seamless tile.
Source V. Hartikainen
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß