Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Remixed from a drawing in 'Incidents on a Journey through Nubia to Darfoor', F. Ensor, 1891.
Source Firkin
Alternative colour scheme for the original floral pattern.
Source Firkin
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Might not be super subtle, but quite original in its form.
Source Alex Smith
Fix side and a seamless pattern formed from circles.
Source SliverKnight
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
A bit of scratched up grayness. Always good.
Source Dmitry