Derived from a drawing in 'Historiske Afhandlinger', Adolf Jorgensen, 1898.
Source Firkin
This light blue background pattern is quite pleasing to the eye, it consists of a tiny rough grid pattern, which is seamless by design. That's it, if you like the color, you can use this seamless pattern in a web design without making any further modifications to it.
Source V. Hartikainen
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
A dark striped seamless pattern suitable for use as a background on websites.
Source V. Hartikainen
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
A seamless pattern made from the gold Penrose triangle by GDJ and the two remixes
Source Firkin
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Inspired by this, I came up with this pattern. Madness!
Source Atle Mo
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
Zero CC tileable hard cover red book, scanned and made by me. CC0
Source Sojan Janso
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
A new take on the black linen pattern. Softer this time.
Source Atle Mo
Looks like an old rug or a computer chip.
Source Patutin Sergey
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem
Here's an yet another seamless note paper texture for use as a background on websites.
Source V. Hartikainen
A seamless pattern formed from background pattern 102
Source Firkin