You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
Green Web Background, Seamless tile.
Source V. Hartikainen
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
Zero CC tileable hard cover green book, scanned and made by me. CC0
Source Sojan Janso
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
You may use it as is, or modify it as you like.
Source V. Hartikainen
Psychedelic Geometric Background No Black
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
Green Background Pattern
Source V. Hartikainen
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Never out of fashion and so much hotter than the 45º everyone knows, here is a sweet 60º line pattern.
Source Atle Mo