Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
A seamless texture of worn out "cardboard".
Source V. Hartikainen
Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
Source Firkin
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
Prismatic Abstract Geometric Background derived from an image on Pixabay.
Source GDJ
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
The edges of all the red objects line up either vertically or horizontally, but it doesn't appear so. Made from a square tile that can be got by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin