This could be a hippy vintage wallpaper.
Source Tileable Patterns
A seamless canvas texture for using as background on websites. Colored in pale tones of brown.
Source V. Hartikainen
The tile can be had by selecting the rectangle in Inkscape and using shift+alt+i. Remixed from a drawing in 'Flowers of Song', Frederick Weatherly, 1895.
Source Firkin
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Abstract Geometric Background 5
Source GDJ
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
Inspired by a design found in 'Konstantinápolyi emlékeim', Miklos Chriszto, 1893.
Source Firkin
Same as gray sand but lighter. A sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A seamless web background with texture of aged grid paper.
Source V. Hartikainen
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Seamless pattern made from a tile that can be obtained in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae