Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
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 based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Sort of reminds me of those old house wallpapers.
Source Tish
CC0 and seamless wellington boot pattern.
Source SliverKnight
The image depicts polka dot seamless pattern.
Source Yamachem
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
An alternative colour scheme to the original seamless pattern.
Source Firkin
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
A seamlessly tile-able grunge background image.
Source V. Hartikainen
A nice and simple white rotated tile pattern.
Source Another One