Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
Colorful Floral Background 3 No Black
Source GDJ
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
Looks like an old rug or a computer chip.
Source Patutin Sergey
This tiled background comes in red and consists of tiles that look like gemstones. It is more for blogs or social profiles, I think.
Source V. Hartikainen
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
Embossed lines and squares with subtle highlights.
Source Alex Parker
Prismatic Hexagonalism Pattern No Background
Source GDJ
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
If you want png files of thisu can download them here :
Source Viscious-Speed
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin