From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A cute x, if you need that sort of thing.
Source Juan Scrocchi
Retro Circles Background 5 No Black
Source GDJ
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
Gold Triangular Seamless Pattern No Background
Source GDJ
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
Prepared mostly as a raster in Paint.net and vectorised.
Source Firkin
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Prismatic Geometric Pattern Background
Source GDJ
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain