You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
Zero CC tileable hard cover green book, scanned and made by me. CC0
Source Sojan Janso
Colour version of the original seamless pattern.
Source Firkin
Lovely pattern with splattered vintage speckles.
Source David Pomfret
From a drawing in 'Kingsdene', Maria Fetherstonehaugh, 1878.
Source Firkin
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
A comeback for you: the popular Escheresque, now in black.
Source Patten
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
You may use it as is, or modify it as you like.
Source V. Hartikainen
Orange-red pattern for tiled backgrounds.
Source V. Hartikainen
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
Prismatic Hexagonalist Pattern No Background
Source GDJ
Colourful background achieved with gradient fills.
Source Firkin
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
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
This was formed by distorting an image of a background on Pixabay.
Source Firkin
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Super dark, crisp and detailed. And a Kill Bill reference.
Source Badhon Ebrahim