From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
White little knobs, coming in at 10x10px. Sweet!
Source Amos
A rusty grunge background for websites. Feel free to use it in your site's theme.
Source V. Hartikainen
A seamless texture of a rough concrete surface.
Source V. Hartikainen
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
Retro Circles Background 5 No Black
Source GDJ
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
From a drawing in 'Hundert Jahre in Wort und Bild', S. Stefan, 1899.
Source Firkin
Remixed from a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
A repeating background of beige (or is it more vanilla yellow) textured stripes. One more background with stripes.
Source V. Hartikainen
Just the symbols of the signs of the zodiac distributed in a chequer board-like pattern
Source Firkin
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com
Source Atle Mo
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
Prismatic Rounded Squares Grid 3 No Background
Source GDJ