As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Plywood Web Background background image for use in web design.
Source V. Hartikainen
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
A repeating background of thick textured paper. Actually, it turned out to look like something between a paper and fabric.
Source V. Hartikainen
A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
A background pattern with blue on white vertical stripes.
Source V. Hartikainen
Prismatic Groovy Concentric Background No Black
Source GDJ
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Prismatic Polka Dots Mark II 2 No Background
Source GDJ