This is so subtle you need to bring your magnifier!
Source Carlos Valdez
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A pale olive green background with a seamless texture.
Source V. Hartikainen
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
Prismatic Basic Pattern 2 No Background
Source GDJ
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A free seamless texture of reptile skin colored in a dark brown color. As always, you may use it as a repeated background image in your web design works, or for any other purposes.
Source V. Hartikainen
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
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
Prismatic Polyskelion Pattern No Background
Source GDJ
emixed from a JPG that was uploaded to Pixabay by Kyotime
Source Firkin