Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
Prismatic Groovy Concentric Background 4
Source GDJ
Prismatic Abstract Background Design
Source GDJ
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
Uses spirals from Pixabay. To get the basic tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin
The image depicts a seamless pattern made using a bird's face.
Source Yamachem
I have no idea how to describe this one, but it’s light and delicate.
Source JBasoo
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Prismatic Abstract Geometric Background 4
Source GDJ