The image is a design of blue glass.How about using it as background image?
Source Yamachem
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Prismatic Abstract Geometric Background 2
Source GDJ
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A lot of people like the icon patterns, so here’s one for your restaurant blog.
Source Andrijana Jarnjak
emixed from a JPG that was uploaded to Pixabay by Kyotime
Source Firkin
Zero CC tileable ground cracked, crackled, texture, made by me.
Source Sojan Janso
This is a seamless pattern of a woody texture.The original image is here:https://pixabay.com/ja/users/ClassicallyPrinted-1302233/
Source Yamachem
A rusty grunge background for websites. Feel free to use it in your site's theme.
Source V. Hartikainen
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Geometric triangles seem to be quite hot these days.
Source Pixeden
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Sort of reminds me of those old house wallpapers.
Source Tish