Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
A nice one indeed, but I have a feeling we have it already? If you spot a copy, let me know on Twitter.
Source Graphiste
This is the remix of an OCAL clipart called "Art Nouveau ornament" uploaded by "microcosme".Thanks.This is a seamless pattern of an Art Nouveau ornament.
Source Yamachem
This is the remix of "Background pattern 115" uploaded by "Firkin".Thanks.
Source Yamachem
Kaleidoscope Prismatic Abstract No Background
Source GDJ
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Colourful background achieved with gradient fills.
Source Firkin
A repeating graphic with ancient pattern. I came up with this name/title at last minute, so you may find that there is very little of ancientness in this pattern after all.
Source V. Hartikainen
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
A background pattern with wavy green vertical stripes. This one has green stripes on a white background. Download if you like it.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Some dark 45 degree angles creating a nice pattern. Huge.
Source Dark Sharp Edges
This is so subtle you need to bring your magnifier!
Source Carlos Valdez