Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
A comeback for you: the popular Escheresque, now in black.
Source Patten
Inspired by a pattern I saw in a 19th century book. This seamless pattern was created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
Here's a camo print with more tan and less green, such as might be used in a desert scenario. This is tileable, so it can be used as a wallpaper or background.
Source Eady
Retro Circles Background 8 No Black
Source GDJ
This seamless web background texture looks like gray stone. It's great for using as a background image on web pages, or on some of their elements. Anyway, I hope you will find use for it.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Zero CC plastic pattern texture, photographed and made by me. CC0 *Note, this texture was on the perfectly smooth surface of a plastic shovel scraper, not sure how to call it. Plz coment if you know what its called.
Source Sojan Janso
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Retro Circles Background 7 No Black
Source GDJ