I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
Same as gray sand but lighter. A sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Fix side and a seamless pattern formed from circles.
Source SliverKnight
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
A seamless gray background texture suitable for use on websites. To me, it has the look of stone. Feel free to modify it to meet your needs (by making it a bit lighter or darker, for example).
Source V. Hartikainen
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
Prismatic Hypnotic Pattern No Background
Source GDJ
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
Dark blue concrete wall with some small dust spots.
Source Atle Mo
A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen
A dark gray, sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
The original enhanced with one of Inkscapes's filters.
Source Firkin
The texture of this background image has some similarities with leather, and it's colored in a dark brown color. So, if you are looking for a dark brown background image for your website, this may be an option for you.
Source V. Hartikainen