Prismatic Groovy Concentric Background 5 No Black
Source GDJ
Lovely pattern with splattered vintage speckles.
Source David Pomfret
An alternative colour scheme for the original background.
Source Firkin
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
There are many carbon patterns, but this one is tiny.
Source Designova
Black paper texture, based on two different images.
Source Atle Mo
Based from Design Kindle
This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
The image a seamless pattern derived from a weed which I can't identify.The original weed image is from here:https://jp.pinterest.com/pin/500744052301423641/
Source Yamachem
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
From a drawing in 'Heroes of North African Discovery', Nancy Meugens, 1894.
Source Firkin
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Background formed from the original with an emboss effect
Source GDJ
A seamless background texture of old cardboard.
Source V. Hartikainen
Here's a subtle marble-like background for use on websites.
Source V. Hartikainen
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
ZeroCC tileabel stone granite texture, edited from pixabay. CC0
Source Sojan Janso