A comeback for you: the popular Escheresque, now in black.
Source Patten
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Background formed from the original with an emboss effect.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
The edges of all the red objects line up either vertically or horizontally, but it doesn't appear so. Made from a square tile that can be got by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
ZeroCC tileabel stone granite texture, edited from pixabay. CC0
Source Sojan Janso
A seamless textured paper for backgrounds. Colored in pale orange hues.
Source V. Hartikainen