The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Seamless pattern formed from a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
Prismatic Snowflakes Pattern No Background
Source GDJ
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Same as gray sand but lighter. A sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Remixed from an image that was uploaded to Pixabay by KirstenStar
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Can’t believe we don’t have this in the collection already! Slick woven pattern with crisp details.
Source Max Rudberg
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Subtle scratches on a light gray background.
Source Andrey Ovcharov
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim