Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
The tile for this is based on a repeating unit close to a design on Pixabay. It can be had by selecting the rectangle in Inkscape and using 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
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Subtle scratches on a light gray background.
Source Andrey Ovcharov
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Seamless pattern inspired by a drawing on Pixabay. To get the tile this is formed from, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski