An abstract Background pattern of purple twisty patterns.
Source TikiGiki
The image a seamless pattern derived from a weed which I can't identify.The original weed image is from here:https://jp.pinterest.com/pin/500744052301423641/
Source Yamachem
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
The image depicts an edo-era pattern called "same-komon" or "鮫小紋"which looks like a shark skin.The "same" in Japanese means shark in English.
Source Yamachem
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
From a drawing in 'Friend or Fortune? The story of a strange year', Robert Overton, 1897.
Source Firkin
Never out of fashion and so much hotter than the 45º everyone knows, here is a sweet 60º line pattern.
Source Atle Mo
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
This is a remix of "geometrical pattern 01".
Source Yamachem
Colorful Floral Background 3 No Black
Source GDJ
Prismatic Polka Dots 3 No Background
Source GDJ
That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
A set of paper filters. The base texture is generated the same way, only the compositing mode is varied.
Source Lazur URH
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae