From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin
A floral background formed from numerous clones of flower 117.
Source Firkin
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
A light gray background pattern with seamless fabric-like texture and almost unnoticeable stripes.
Source V. Hartikainen
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
The original enhanced with some gradients.
Source Firkin
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
Black brick wall pattern. Brick your site up!
Source Alex Parker
Sort of reminds me of those old house wallpapers.
Source Tish
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Here's a camo print with more tan and less green, such as might be used in a desert scenario. This is tileable, so it can be used as a wallpaper or background.
Source Eady
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
A comeback for you: the popular Escheresque, now in black.
Source Patten
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green