I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
Orange-red pattern for tiled backgrounds.
Source V. Hartikainen
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Use shift+alt+i on the selected rectangle in Inkscape to get the tile this is based on
Source Firkin
A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
Might not be super subtle, but quite original in its form.
Source Alex Smith
Sort of reminds me of those old house wallpapers.
Source Tish
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Sharp pixel pattern, just like the good old days.
Source Paridhi
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
Formed by distorting an image on Pixabay that was uploaded by gustavorezende. To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin