Remixed from a drawing in 'Analecta Eboracensia', Thomas Widdrington, 1897.
Source Firkin
From a drawing in 'Friend or Fortune? The story of a strange year', Robert Overton, 1897.
Source Firkin
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Colour version of the original seamless pattern.
Source Firkin
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
The tile this is based on was adapted from an image that was uploaded to Pixabay by frolicsomepl. It can be had in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
Background pattern originally a PNG drawn in Paint.net
Source Firkin
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
There are many carbon patterns, but this one is tiny.
Source Designova
A seamless pattern of "sewn stripes" colored in light gray.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin