A seamless pattern drawn originally in Paint.net by distorting a slice of background pattern 116 and copying the resulting triangle numerous times.
Source Firkin
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Prismatic Abstract Background Design
Source GDJ
Prismatic Hexagonalist Pattern No Background
Source GDJ
Remixed from a drawing in 'Incidents on a Journey through Nubia to Darfoor', F. Ensor, 1891.
Source Firkin
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
From a drawing in 'Handbook of the excursions proposed to be made by the Lincoln Diocesan Architectural Society, on the 27th and 28th of May, 1857', Edward Trollope, 1857.
Source Firkin
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Just the symbols of the signs of the zodiac distributed in a chequer board-like pattern
Source Firkin
Otis Ray Redding was an American soul singer-songwriter, record producer, arranger, and talent scout. So you know.
Source Thomas Myrman
Feel free to download and use it, or see the rest of the dark background patterns that I have made. Anyway, I hope you will find something that you like.
Source V. Hartikainen
Prismatic Abstract Background Design
Source GDJ
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A version without colours blended together to give a different look.
Source Firkin
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo