Might not be super subtle, but quite original in its form.
Source Alex Smith
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
emixed from a JPG that was uploaded to Pixabay by Kyotime
Source Firkin
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
Prismatic Polka Dots 3 No Background
Source GDJ
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin