Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A chequerboard pattern with a fruit theme. The fruits are from a posting by inkscapeforum.it.
Source Firkin
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Remixed from a drawing in 'Kulturgeschichte der Deutschen im Mittelalter' Franz von Loeher, 1891. The unit tile can be had by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
A pale orange background pattern with glossy groove stripes.
Source V. Hartikainen
Prismatic Polyskelion Pattern No Background
Source GDJ
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
The image depicts a seamless pattern made using a bird's face.
Source Yamachem
Abstract Tiled Background Extended 10
Source GDJ
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
You know, tiny and sharp. I’m sure you’ll find a use for it.
Source Atle Mo
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Sharp but soft triangles in light shades of gray.
Source Pixeden
The image depicts a Japanese Edo pattern called "kanoko or 鹿の子" meaning "fawn" which has a fur with small white spots.
Source Yamachem