From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Hypnotic Pattern No Background
Source GDJ
Free tiled background with colorful stripes and white splatter.
Source V. Hartikainen
Colorful Floral Background 3 No Black
Source GDJ
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
Fix side and a seamless pattern formed from circles.
Source SliverKnight
Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
Source Firkin
The image depicts a pattern of regular hexagon.As I made to use it for myself,I want to others to use it.Speaking about the ratio of the image, height : width = 2 : √3(1.732...)Ridiculous to say,I realized later that this image is not honey comb pattern.I have to slide the second row.
Source Yamachem
Colour version of the original pattern inspired by the front cover of 'Old and New Paris', Henry Edwards, 1894.
Source Firkin
Prismatic Polka Dots 3 No Background
Source GDJ
You guessed it – looks a bit like cloth.
Source Peax Webdesign
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Seamless Olive Green Web Background Image
Source V. Hartikainen
An alternative colour scheme to the original seamless pattern.
Source Firkin
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Inspired by a drawing in 'Poems', James Smith, 1881.
Source Firkin
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin