CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Seamless Prismatic Geometric Pattern With Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
The name Paisley reminds me of an old British servant. That’s just me.
Source Swetha
Background Wall, Art Abstract, Star Well & CC0 texture.
Source Ractapopulous
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Remixed from a drawing in 'Jezebel's Daughter', Wilkie Collins 1880
Source Firkin
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
A seamless texture of black leather. I think it will look best when used in headers, footers or sidebars.
Source V. Hartikainen
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
The original enhanced with one of Inkscapes's filters.
Source Firkin