This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'A Life Interest', Mrs Alexander, 1888.
Source Firkin
Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
There are many carbon patterns, but this one is tiny.
Source Designova
Prismatic Polka Dots 3 No Background
Source GDJ
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
A seamless pale yellow paper background with a pattern of animal tracks.
Source V. Hartikainen
Zero CC tileable Crackled Cement (streaks) texture, photographed and made by me. CC0
Source Sojan Janso
Remixed from a PNG that was uploaded to Pixabay by gingertea
Source Firkin
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury
Orange-red pattern for tiled backgrounds.
Source V. Hartikainen
Remixed from a drawing in 'A Girl in Ten Thousand', Elizabeth Meade, 1896.
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Seamless Green Tile Background
Source V. Hartikainen
Just like the black maze, only in light gray. Duh.
Source Peax
A repeating background of beige (or is it more vanilla yellow) textured stripes. One more background with stripes.
Source V. Hartikainen