You may use it as is, or modify it as you like.
Source V. Hartikainen
This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
A nice one indeed, but I have a feeling we have it already? If you spot a copy, let me know on Twitter.
Source Graphiste
This background pattern contains worn out colorful stripes as a texture.
Source V. Hartikainen
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Original minus the background
Source Firkin
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
A seamless background tile of aged paper with shabby look.
Source V. Hartikainen
The original enhanced with some gradients.
Source Firkin
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
I have no idea how to describe this one, but it’s light and delicate.
Source JBasoo
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Inspired by a JPG that was uploaded to Pixabay by kokon_art
Source Firkin
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova