A seamless pattern with a unit cell drawn as a bitmap in Paint.net and vectorized in Vector Magic.
Source Firkin
Prismatic Hexagonalism Pattern No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A free background pattern with abstract green tiles.
Source V. Hartikainen
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
Abstract Tiled Background Extended 11
Source GDJ
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
From a drawing in 'Az Osztrák-Magyar Monarchia irásban és képben', 1885.
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
A repeating background with wood/straw like texture.
Source V. Hartikainen
Looks like an old rug or a computer chip.
Source Patutin Sergey
I asked Gjermund if he could make a pattern for us – result!
Source Gjermund Gustavsen
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Can’t believe we don’t have this in the collection already! Slick woven pattern with crisp details.
Source Max Rudberg
Number 4 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Lovely pattern with splattered vintage speckles.
Source David Pomfret