From a drawing in 'Hyde Park from Domesday-Book to date', John Ashton, 1896.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A seamless pattern made from the gold Penrose triangle by GDJ and the two remixes
Source Firkin
A seamless texture of a rough concrete surface.
Source V. Hartikainen
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
The image depicts the Japanese Edo pattern called "seigaiha" or "青海波" meaning "blue -sea- wave".I hope it's suitable for the summer season.
Source Yamachem
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
Retro Circles Background 4 No Black
Source GDJ
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Prismatic Groovy Concentric Background 3
Source GDJ
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Seamless Prismatic Geometric Pattern With Background
Source GDJ
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin