Zero CC tileable hard cover green book, scanned and made by me. CC0
Source Sojan Janso
Colourful background achieved with gradient fills.
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Geometric triangles seem to be quite hot these days.
Source Pixeden
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.
Source Firkin
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
By popular request, an outline version of the pentagon pattern.
Source Atle Mo
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The base gradient edited so now more details are rendered.
Source Lazur URH
This is the remix of an OCAL clipart called "Rain on Window" uploaded by "pagarmidna".Thanks.This is a seamless pattern of raindrops.
Source Yamachem
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A brown seamless wood texture in a form of stripe pattern. The result has turned out pretty well, in my opinion.
Source V. Hartikainen
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc