The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
A yellow tiled background... Blurriness, bokeh effect and rectangles pattern in one mix.
Source V. Hartikainen
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
This was formed by distorting an image of a background on Pixabay.
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
Retro Circles Background 8 No Black
Source GDJ
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin