Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
Remixed from a drawing in 'Prehistoric Man: researches into the origin of civilisation in the old and the new world', Daniel Wilson, 1876.
Source Firkin
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
This is the remix of "Colorful Floral Pattern Background 3" uploaded by "GDJ". Thanks.
Source Yamachem
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
A free seamless background texture of "timber wall" (colored in dark brown).
Source V. Hartikainen
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Zero CC tileable yellow craft paper; scanned and made by me. CC0
Source Sojan Janso
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Light and tiny, just the way you like it.
Source Rohit Arun Rao
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Prismatic Curved Diamond Pattern No Background
Source GDJ
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba