This is a hot one. Small, sharp and unique.
Source GraphicsWall
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Remixed from a drawing in 'Kulturgeschichte der Deutschen im Mittelalter' Franz von Loeher, 1891. The unit tile 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
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Prepared mostly as a raster in Paint.net and vectorised.
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
Seamless Prismatic Quadrilateral Line Art Pattern No Background
Source GDJ
Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
Abstract Tiled Background Extended 8
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A dark metal plate with an embossed grid pattern and a bit of rust. Here's a dark metal plate texture for use as a tiled background on web pages.
Source V. Hartikainen
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
From a drawing in 'Hubert Montreuil, or the Huguenot and the Dragoon', Francisca Ouvry, 1873.
Source Firkin