An alternative colour scheme for the original background.
Source Firkin
Embossed lines and squares with subtle highlights.
Source Alex Parker
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Colorful Floral Background 3 No Black
Source GDJ
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
Geometric triangles seem to be quite hot these days.
Source Pixeden
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Might not be super subtle, but quite original in its form.
Source Alex Smith
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
Sharp pixel pattern, just like the good old days.
Source Paridhi
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective