Prismatic Abstract Background Design
Source GDJ
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
From a drawing in 'Az Osztrák-Magyar Monarchia irásban és képben', 1885.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
From a drawing in 'Picturesque New Guinea', J Lindt, 1887.
Source Firkin
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
A seamless pattern of dark bricks. Maybe it's not very realistic, but it looks good in my opinion.
Source V. Hartikainen
A seamless texture of a rough concrete surface.
Source V. Hartikainen
A comeback for you: the popular Escheresque, now in black.
Source Patten
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin