This could be a hippy vintage wallpaper.
Source Tileable Patterns
A dark gray, sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
Derived from an image that was uploaded to Pixabay by pugmom40
Source Firkin
A seamless tessellation pattern. To get the tile this is formed from, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
You know you love wood patterns, so here’s one more.
Source Richard Tabor
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Seamless pattern the basic tile for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A black tile-able background with paper-like texture.
Source V. Hartikainen
A seamless pattern with green and yellow diagonal lines on top of a white dotted background.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
This is the remix of "blue wave-seigaiha".The image depicts a seamless pattern of the front upper part of Japanese five yen coin which is used currently.This design represents a rice with ripe golden ears.
Source Yamachem
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
An abstract web texture of a polished blue stone (or does it look more like ice).
Source V. Hartikainen
ZeroCC tileable beechwood wood texture, generated in Neo Texture Edit by me. CC0
Source Sojan Janso
Prismatic Abstract Line Art Pattern Background
Source GDJ
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Zero CC tileable dry grass texture, photographed and made by me. CC0
Source Sojan Janso
Utilising some flowers from Almeidah. To get the unit 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
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Prismatic Groovy Concentric Background
Source GDJ