Here's a seamless brown cork board background texture. Feel free to download or reshare if you like.
Source V. Hartikainen
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
This one has rusty dark brown texture.
Source V. Hartikainen
Prismatic Groovy Concentric Background 2
Source GDJ
A seamless pattern formed from miutopia's cakes on a tablecloth.
Source Firkin
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
A light background pattern with diagonal stripes. Here's a simple light striped background for you.
Source V. Hartikainen
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
A criss-cross pattern similar to one I saw mown into a sports field.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
This is the remix of an OCAL clipart called "Rain on Window" uploaded by "pagarmidna".Thanks.This is a seamless pattern of raindrops.
Source Yamachem
This is sort of fresh, but still feels a bit old school.
Source Martuchox
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
Some dark 45 degree angles creating a nice pattern. Huge.
Source Dark Sharp Edges