Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
A seamless pattern formed from background pattern 102
Source Firkin
A lot of people like the icon patterns, so here’s one for your restaurant blog.
Source Andrijana Jarnjak
This background pattern contains a texture of yellow wood planks. I think it looks quite original.
Source V. Hartikainen
The image depicts a seamless pattern of a snow crystal.I referred to a book called ”sekka-zusetsu” or "雪華図説" which means an illustrated explanation about snow crystals.This book was published in 1832 (天保3年) or Edo period.For more about "雪華図説",see here:dl.ndl.go.jp/info:ndljp/pid/2536975
Source Yamachem
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
The original enhanced with some gradients.
Source Firkin
From a drawing in 'Hundert Jahre in Wort und Bild', S. Stefan, 1899.
Source Firkin
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
Prismatic Geometric Pattern Background 2
Source GDJ
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Might not be super subtle, but quite original in its form.
Source Alex Smith
This background pattern contains worn out colorful stripes as a texture.
Source V. Hartikainen
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ