Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
Remixed from a drawing in 'Incidents on a Journey through Nubia to Darfoor', F. Ensor, 1891.
Source Firkin
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
Might not be super subtle, but quite original in its form.
Source Alex Smith
The starting point for this was drawn on the web site steamcoded.org/PolyskelionMaker.svg
Source Firkin
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
From a drawing in 'From Snowdon to the Sea. Striking stories of North and South Wales', Marie Trevelyan, 1895.
Source Firkin
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Zero CC tileable ground cracked, crackled, texture, made by me.
Source Sojan Janso
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
A version without colours blended together to give a different look.
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
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-brown.
Source Yamachem
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Looks as if it's spray painted on the wall. You can be sure that this pattern will seamlessly fill your backgrounds on web pages.
Source V. Hartikainen
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers