Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
A bit strange this one, but nice at the same time.
Source Diogo Silva
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
This one is amazing, truly original. Go use it!
Source Viahorizon
Prismatic Groovy Concentric Background
Source GDJ
Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
Abstract Tiled Background Extended 8
Source GDJ
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A seamless background tile of aged paper with shabby look.
Source V. Hartikainen
A free background pattern with abstract green tiles.
Source V. Hartikainen
From a drawing in 'A Guide to the Guildhall of the City of London', John Baddeley, 1898.
Source Firkin
Seamless Green Tile Background
Source V. Hartikainen
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem
Alternative colour scheme for the original floral pattern.
Source Firkin