Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
Free tiled background with colorful stripes and white splatter.
Source V. Hartikainen
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 comeback for you: the popular Escheresque, now in black.
Source Patten
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
From a drawing in 'Royal Ramsgate', James Simson, 1897.
Source Firkin
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
A white version of the very popular linen pattern.
Source Ant Ekşiler
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Just the symbols of the signs of the zodiac distributed in a chequer board-like pattern
Source Firkin
A seamless background of warped stripes on paper.
Source V. Hartikainen
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
Gold Triangular Seamless Pattern No Background
Source GDJ
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
Zero CC tileable grass texture, photographed and made by me. CC0
Source Sojan Janso
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
A seamless pattern formed from background pattern 102
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim