Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
Remixed from a PNG that was uploaded to Pixabay by gingertea
Source Firkin
Sort of like the back of a wooden board. Light, subtle, and stylish, just the way we like it!
Source Nikolalek
Looks like an old wall. I guess that’s it then?
Source Viahorizon
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
The following orange background pattern resembles a honeycomb.
Source V. Hartikainen
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-yellow.
Source Yamachem
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Psychedelic Geometric Background No Black
Source GDJ
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
A background pattern with green vertical stripes. A new striped background pattern. This time a green one.
Source V. Hartikainen
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
A seamless texture of worn out "cardboard".
Source V. Hartikainen
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
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić