Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
From a drawing in 'La Principauté de Liège et les Pays-Bas au XVIe siècle', Société des Bibliophiles Liégeois ,1887.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin
Abstract Ellipses Background Grayscale
Source GDJ
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Used a cherry by doctormo to make this seamless pattern
Source Firkin
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
A seamless design of flowers remixed from a jpg on Pixabay by Prawny.
Source Firkin
Sort of like the back of a wooden board. Light, subtle, and stylish, just the way we like it!
Source Nikolalek
A pale orange background pattern with glossy groove stripes.
Source V. Hartikainen
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
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Here's a dark background pattern that contains a steel grid pattern as a texture. Use it as a website background or for other purposes. It's free!
Source V. Hartikainen