Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I. A version of the original with random colors.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Continuing the geometric trend, here is one more.
Source Mike Warner
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Original minus the background
Source Firkin
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
A blue background wallpaper for websites. It has a seamless texture with vertical stripes. It looks quite nice not only when using as a tiled background on websites, but also on computer desktops.
Source V. Hartikainen
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
From a drawing in 'Two Women in the Klondike', Mary Hitchcock, 1899.
Source Firkin
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim