This is a seamless pattern of regular hexagon which has a honeycomb structure.
Source Yamachem
Prismatic Groovy Concentric Background 5
Source GDJ
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Alternative colour scheme to the original.
Source Firkin
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
Some dark 45 degree angles creating a nice pattern. Huge.
Source Dark Sharp Edges
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
A bit of scratched up grayness. Always good.
Source Dmitry
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Found on the ground in french cafe in kunming, Yunnan, china
Source Rejon
Zero CC tileable yellow craft paper; scanned and made by me. CC0
Source Sojan Janso
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
The image depicts an edo-era pattern called "same-komon" or "鮫小紋"which looks like a shark skin.The "same" in Japanese means shark in English.
Source Yamachem
This is a remix of "geometrical pattern 01".
Source Yamachem
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
Zero CC tileable cork floor, photographed and made by me. CC0
Source Sojan Janso
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker