The image depicts a seamless pattern made using a bird's face.
Source Yamachem
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
Abstract Tiled Background Extended 8
Source GDJ
A new one called white wall, not by me this time.
Source Yuji Honzawa
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
From a drawing in 'Real Sailor-Songs', John Ashton, 1891.
Source Firkin
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
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
A cute x, if you need that sort of thing.
Source Juan Scrocchi
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
The name Paisley reminds me of an old British servant. That’s just me.
Source Swetha
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
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
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin