From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Original seamless pattern with an Inkscape filter.
Source Firkin
This one needs to be used in small areas; you can see it repeat.
Source Luca
Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
From a drawing in 'Jardyne's Wife', Charles Wills, 1891.
Source Firkin
From a drawing in 'Picturesque New Guinea', J Lindt, 1887.
Source Firkin
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i
Source Firkin
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Psychedelic Geometric Background No Black
Source GDJ
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
A seamless pattern formed from background pattern 102
Source Firkin
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Tiny circle waves, almost like the ocean.
Source Sagive
Alternative colour scheme to the original.
Source Firkin
A seamless pattern with a unit cell drawn as a bitmap in Paint.net and vectorized in Vector Magic.
Source Firkin