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
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Prismatic Snowflakes Pattern No Background
Source GDJ
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Sort of reminds me of those old house wallpapers.
Source Tish
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
The tile can be had by using shift+alt+i on the selected rectangle in Inkscape
Source Firkin
This one needs to be used in small areas; you can see it repeat.
Source Luca
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Classic vertical lines, in all its subtlety.
Source Cody L
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Prismatic Geometric Pattern Background No Black
Source GDJ
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin