This one is amazing, truly original. Go use it!
Source Viahorizon
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
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 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
A seamless web texture with illustration of pale color stains on canvas.
Source V. Hartikainen
From a drawing in 'Friend or Fortune? The story of a strange year', Robert Overton, 1897.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
You guessed it – looks a bit like cloth.
Source Peax Webdesign
Original minus the background
Source Firkin
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
Vector version of a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
To celebrate the new feature, we need some sparkling diamonds.
Source Atle Mo
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
More in the paper realm, this time with fibers.
Source Jorge Fuentes