A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
Zero CC tillable hard cover red book with X shape marks. Scanned and made by me.
Source Sojan Janso
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
The image depicts a Japanese Edo pattern called "kanoko or 鹿の子" meaning "fawn" which has a fur with small white spots.
Source Yamachem
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
Embossed lines and squares with subtle highlights.
Source Alex Parker
This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
A heavy hitter at 400x400px, but lovely still.
Source Breezi
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
A brown seamless wood texture in a form of stripe pattern. The result has turned out pretty well, in my opinion.
Source V. Hartikainen
White handmade paper pattern with small bumps.
Source Marquis