From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
Geometric triangles seem to be quite hot these days.
Source Pixeden
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
There are many carbon patterns, but this one is tiny.
Source Designova
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin