This is a seamless pattern of a woody texture.The original image is here:https://pixabay.com/ja/users/ClassicallyPrinted-1302233/
Source Yamachem
This could be a hippy vintage wallpaper.
Source Tileable Patterns
Zero CC tileable brick texture, photographed and made by me. CC0
Source Sojan Janso
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
A version without colours blended together to give a different look.
Source Firkin
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
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
Prismatic Groovy Concentric Background No Black
Source GDJ
Prismatic Groovy Concentric Background 2
Source GDJ
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Seamless Green Tile Background
Source V. Hartikainen
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin