Prepared mostly as a raster in Paint.net and vectorised.
Source Firkin
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
A floral background formed from numerous clones of flower 117.
Source Firkin
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless light gray paper texture with horizontal double lines.
Source V. Hartikainen
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
This is a seamless pattern which is derived from a flower petal image.
Source Yamachem
Here I have tried to create something that would look like maple wood. Not sure how well it's turned out, but at least it looks like wood.
Source V. Hartikainen
Seamless Olive Green Web Background Image
Source V. Hartikainen
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
The base gradient edited so now more details are rendered.
Source Lazur URH
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
Zero CC tileable brick texture, photographed and made by me. CC0
Source Sojan Janso
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Traced from a drawing in 'Household Stories from the Collection of the Brothers Grimm', Wilhelm Carl Grimm , 1882.
Source Firkin
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers