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
Seamless pattern inspired by a drawing on Pixabay. To get the tile this is formed from, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
Embossed lines and squares with subtle highlights.
Source Alex Parker
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Here's a brown background pattern with subtle stripes. I hope you'll like the color. If not, feel free to change it using an image editor, if you know how of course. Personally, I'm using GIMP to create these backgrounds.
Source V. Hartikainen
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
A gray background pattern with a texture of textile. Suits perfectly for web design.
Source V. Hartikainen
This one needs to be used in small areas; you can see it repeat.
Source Luca
A comeback for you: the popular Escheresque, now in black.
Source Patten
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin