Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Fix side and a seamless pattern formed from circles.
Source SliverKnight
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Abstract Tiled Background Extended 10
Source GDJ
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
Here's a subtle marble-like background for use on websites.
Source V. Hartikainen
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
Zero CC tileable hard cover cells, skin like, book texture. 4K, Scanned and made by me CC0
Source Sojan Janso
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
You know you love wood patterns, so here’s one more.
Source Richard Tabor
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau