A comeback for you: the popular Escheresque, now in black.
Source Patten
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
Prismatic Triangular Background Design Mark II 5
Source GDJ
A grayscale fabric pattern with vertical lines of stitch holes.
Source V. Hartikainen
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Kaleidoscope Prismatic Abstract No Background
Source GDJ
Seamless Olive Green Web Background Image
Source V. Hartikainen
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous