This could be a hippy vintage wallpaper.
Source Tileable Patterns
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Seamless tile drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Otis Ray Redding was an American soul singer-songwriter, record producer, arranger, and talent scout. So you know.
Source Thomas Myrman
This is a remix of "geometrical pattern 01".
Source Yamachem
A seamless pattern formed from cross 4. To get the original tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
Remixed from an image that was uploaded to Pixabay by KirstenStar
Source Firkin
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
Just like the black maze, only in light gray. Duh.
Source Peax
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
Here's a new paper-like background for free use on personal and commercial projects (this applies to all background patterns here).
Source V. Hartikainen
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
The edges of all the red objects line up either vertically or horizontally, but it doesn't appear so. Made from a square tile that can be got by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Sometimes you just need the simplest thing.
Source Fabricio
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Different from the original in being a simple tile stored as a pattern definition, rather than numerous repeated objects. Hence easy and quick to give this pattern to objects of different shapes. To get the tile in Inkscape, select the rectangle and use shift+alt+i.
Source Firkin