This background has abstract texture with some similarities to wood.
Source V. Hartikainen
The original enhanced with some gradients.
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
This one needs to be used in small areas; you can see it repeat.
Source Luca
From a drawing in 'Hubert Montreuil, or the Huguenot and the Dragoon', Francisca Ouvry, 1873.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Derived from a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Geometric Pattern Background
Source GDJ
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
An abstract web texture of a polished blue stone (or does it look more like ice).
Source V. Hartikainen
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
The image a seamless pattern derived from a weed which I can't identify.The original weed image is from here:https://jp.pinterest.com/pin/500744052301423641/
Source Yamachem
Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin