Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
This is the remix of "Background pattern 115" uploaded by "Firkin".Thanks.
Source Yamachem
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
A free seamless background texture that looks like a brown stone wall.
Source V. Hartikainen
An alternative colour scheme to the original seamless pattern.
Source Firkin