Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
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
An alternative colour scheme to the original seamless pattern.
Source Firkin
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
Psychedelic Geometric Background No Black
Source GDJ
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Prismatic Groovy Concentric Background 5
Source GDJ
Prismatic Curved Diamond Pattern No Background
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i
Source Firkin