Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
Prismatic Abstract Geometric Background 4
Source GDJ
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Seamless Prismatic Quadrilateral Line Art Pattern No Background
Source GDJ
From a drawing in 'Az Osztrák-Magyar Monarchia irásban és képben', 1885.
Source Firkin
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
Prismatic Hexagonalist Pattern No Background
Source GDJ
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Prismatic Groovy Concentric Background
Source GDJ
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
There are many carbon patterns, but this one is tiny.
Source Designova
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Prismatic Abstract Geometric Background 4
Source GDJ