People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
This was submitted in a beige color, hence the name. Now it’s a gray paper pattern.
Source Konstantin Ivanov
Fix side and a seamless pattern formed from circles.
Source SliverKnight
Colorful Floral Background No Black
Source GDJ
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
Seamless Dark Grunge Texture. Here's a new grunge texture for use as a background.
Source V. Hartikainen
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
I scanned a paper coffee cup. You know, in case you need it.
Source Atle Mo
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
Prismatic Groovy Concentric Background 5
Source GDJ
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin