As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
A black tile-able background with paper-like texture.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A version without colours blended together to give a different look.
Source Firkin
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin
Light and tiny, just the way you like it.
Source Rohit Arun Rao
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
Submitted in a cream color, but you know how I like it.
Source Devin Holmes