A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A seamless pattern formed from miutopia mug remixes on a tablecloth.
Source Firkin
Prismatic Snowflakes Pattern No Background
Source GDJ
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
The image is a design of blue glass.How about using it as background image?
Source Yamachem
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Subtle scratches on a light gray background.
Source Andrey Ovcharov
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
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
Remixed from a drawing in 'A Girl in Ten Thousand', Elizabeth Meade, 1896.
Source Firkin
Sort of reminds me of those old house wallpapers.
Source Tish
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc