Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
Prismatic Chevrons Pattern 5 With Background
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
A seamless background pattern of dark brown wood planks.
Source V. Hartikainen
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Prismatic Groovy Concentric Background 2
Source GDJ
Vector version of a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Everyone needs some stardust. Sprinkle it on your next project.
Source Atle Mo
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
Remixed from a drawing in 'Some account of the Worshipful Company of Ironmongers', John Nicholl, 1866.
Source Firkin
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
Element of beach pattern with background.
Source Rones
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
8 by 8 pixels, and just what the title says.
Source pixilated
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau