You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Pattern formed from simple shapes. Black version.
Source Firkin
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
Abstract Tiled Background Extended 12
Source GDJ
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
White handmade paper pattern with small bumps.
Source Marquis
Seamless Green Tile Background
Source V. Hartikainen
Neat little photography icon pattern.
Source Hossam Elbialy
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
A dark gray, sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
Source Firkin
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
A free seamless texture of reptile skin colored in a dark brown color. As always, you may use it as a repeated background image in your web design works, or for any other purposes.
Source V. Hartikainen
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A pale yellow background pattern with vertical stripes. The stripes are partially faded. I think this background image turned out pretty well, especially those faded stripes.
Source V. Hartikainen
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
I’m not going to use the word Retina for all the new patterns, but it just felt right for this one. Huge wood pattern for ya’ll.
Source Atle Mo
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson