The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
The image depicts a seamless pattern of a tortoise in tortoiseshell (hexagon).
Source Yamachem
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
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
Background Wall, Art Abstract, Star Well & CC0 texture.
Source Ractapopulous
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Gold Triangular Seamless Pattern No Background
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
This was formed by distorting an image of a background on Pixabay.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight