Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
From a drawing in 'A Rolling Stone. A tale of wrongs and revenge', John Hartley, 1878.
Source Firkin
Colorful Floral Background 3 No Black
Source GDJ
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Continuing the geometric trend, here is one more.
Source Mike Warner
This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
A bit strange this one, but nice at the same time.
Source Diogo Silva
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Alternative colour scheme for the original floral pattern.
Source Firkin