A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
A seamless pattern based on a rectangular tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Seamless Green Tile Background
Source V. Hartikainen
Prismatic Geometric Pattern Background
Source GDJ
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Feel free to download and use it, or see the rest of the dark background patterns that I have made. Anyway, I hope you will find something that you like.
Source V. Hartikainen
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
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
A seamless pattern of leopard skin. It should look nice as a background element on web pages.
Source V. Hartikainen
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
White handmade paper pattern with small bumps.
Source Marquis
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer