Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Mostly just mucked about with the colours and made one of the paths in the lead frame opaque. The glass remains transparent.
Source Firkin
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
Element of beach pattern with background.
Source Rones
From an image on opengameart.org shared by rubberduck.
Source Firkin
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo