To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
I have no idea how to describe this one, but it’s light and delicate.
Source JBasoo
An alternative colour scheme for the original background.
Source Firkin
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Zero CC tileable Laminate wood texture, photographed and made by me. CC0
Source Sojan Janso
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Zero CC tileable hard cover cells, skin like, book texture. 4K, Scanned and made by me CC0
Source Sojan Janso
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
Remixed from a drawing that was uploaded to Pixabay by captenpub.
Source Firkin
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-brown.
Source Yamachem