Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
U.S.-based National Fire Protection Association standard fire diamond for flagging risks posed by hazardous materials. The red diamond has a number 0-4 depending on flammability. The blue diamond has a number 0-4 depending on health hazard. The yellow has a number 0-4 depending on reactivity. the white square has a special notice, e.g OX for oxidizer.
Source Firkin
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
White circles connecting on a light gray background.
Source Mark Collins
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
Black And White Floral Pattern Background from PDP.
Source GDJ
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
From a drawing in 'Danmarks Riges Historie af J. Steenstrup, Kr. Erslev, A. Heise, V. Mollerup, J. A. Fridericia, E. Holm, A. D. Jørgensen', 1897.
Source Firkin
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A seamless background pattern with a texture of wood planks. This wood background pattern has vertically arranged planks. You may try to rotate it 90°, to see how it will look like when the wood planks are arranged horizontally.
Source V. Hartikainen
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin