A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
The following orange background pattern resembles a honeycomb.
Source V. Hartikainen
A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
An alternative colour scheme for the original background.
Source Firkin
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
The image is a seamless pattern which is derived from a vine .Consequently, the vine got like dots via vectorization.The original vine is here:jp.pinterest.com/pin/500744052301410188/
Source Yamachem
A new take on the black linen pattern. Softer this time.
Source Atle Mo
From a drawing in 'Real Sailor-Songs', John Ashton, 1891.
Source Firkin
Zero CC tileable brick texture, photographed and made by me. CC0
Source Sojan Janso
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ