Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This is the remix of an Openclipart clipart called "Maze" uploaded by "any_ono_mous".Thanks.This is a seamless pattern of a maze.
Source Yamachem
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Prismatic Polka Dots 3 No Background
Source GDJ
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
The image depicts a seamless pattern which was made using stripe-like things including borders.I used OCAL cliparts called "Blue Greek Key With Lines Border" uploaded by "GR8DAN" and "daisy border" uploaded by "johnny_automatic".Thanks.
Source Yamachem
Black paper texture, based on two different images.
Source Atle Mo
Based from Design Kindle
A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Source Firkin
A frame using leaves from an image that was uploaded to Pixabay by mayapujiati
Source Firkin
A dark gray, sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Almost like little fish shells, or dragon skin.
Source Graphiste
I asked Gjermund if he could make a pattern for us – result!
Source Gjermund Gustavsen
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
Prismatic Polyskelion Pattern No Background
Source GDJ
From drawing in 'Musings in Maoriland', Thomas Bracken, 1890.
Source Firkin
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
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Just like the black maze, only in light gray. Duh.
Source Peax
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Prismatic Groovy Concentric Background 4
Source GDJ
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
Original seamless pattern with an Inkscape filter.
Source Firkin
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter