It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Prismatic Geometric Pattern Background 2
Source GDJ
Abstract Ellipses Background Grayscale
Source GDJ
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Remixed from a drawing that was uploaded to Pixabay by captenpub.
Source Firkin
From a drawing in 'A Rolling Stone. A tale of wrongs and revenge', John Hartley, 1878.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Inspired by this, I came up with this pattern. Madness!
Source Atle Mo
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
Light and tiny, just the way you like it.
Source Rohit Arun Rao
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Prismatic Hexagonalist Pattern No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein