A pale olive green background with a seamless texture.
Source V. Hartikainen
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Abstract Tiled Background Extended 12
Source GDJ
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Kaleidoscope Prismatic Abstract No Background
Source GDJ
A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
This is the remix of an Openclipart clipart called "Maze" uploaded by "any_ono_mous".Thanks.This is a seamless pattern of a maze.
Source Yamachem
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman