A comeback for you: the popular Escheresque, now in black.
Source Patten
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Prismatic Abstract Geometric Background 4
Source GDJ
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
Abstract Tiled Background Extended 8
Source GDJ
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Vector version of a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Prismatic Abstract Background Design
Source GDJ
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
Plywood Web Background background image for use in web design.
Source V. Hartikainen
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A new one called white wall, not by me this time.
Source Yuji Honzawa
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin