Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Geometric Tessellation Pattern 4 No Background
Source GDJ
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Alternative colour scheme for the original floral pattern.
Source Firkin
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
This background pattern contains worn out colorful stripes as a texture.
Source V. Hartikainen
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin