From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
From a drawing in 'Az Osztrák-Magyar Monarchia irásban és képben', 1885.
Source Firkin
A seamless gray background texture suitable for use on websites. To me, it has the look of stone. Feel free to modify it to meet your needs (by making it a bit lighter or darker, for example).
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
A free seamless background with pink spots.
Source V. Hartikainen
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Geometric triangles seem to be quite hot these days.
Source Pixeden
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Source Firkin
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab