From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
This is the remix of "Background pattern 115" uploaded by "Firkin".Thanks.
Source Yamachem
It’s big, it’s gradient—and it’s square.
Source Brankic1979
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
This is a more minute version of "fishnet 01".The image depicts a seamless pattern of a fishnet with a plenty of fish.It may be a lucky charm for fishermen.
Source Yamachem
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Remixed from a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Remixed from a PNG that was uploaded to Pixabay by gingertea
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
An interesting one. Lovely at 2X as well!
Source Andreas Föhl
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Colour version of the original seamless pattern.
Source Firkin
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem
Prismatic Geometric Pattern Background 2
Source GDJ
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ