Prismatic Groovy Concentric Background
Source GDJ
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
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 free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen
Sharp pixel pattern, just like the good old days.
Source Paridhi
Prismatic Triangular Background Design Mark II 5
Source GDJ
A free light orange brown wallpaper with vertical stripes designed for use as a tiled background on websites. An yet another background pattern with vertical stripes.
Source V. Hartikainen
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
Seamless tile drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
I scanned a paper coffee cup. You know, in case you need it.
Source Atle Mo
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Background formed from the original with an emboss effect
Source GDJ