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
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
From a drawing in 'Hyde Park from Domesday-Book to date', John Ashton, 1896.
Source Firkin
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
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
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
A green background pattern with warped vertical stripes and a grunge look.
Source V. Hartikainen