Number 2 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A comeback for you: the popular Escheresque, now in black.
Source Patten
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
Geometric triangles seem to be quite hot these days.
Source Pixeden