Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Remixed from a drawing in 'Jezebel's Daughter', Wilkie Collins 1880
Source Firkin
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
Prismatic Groovy Concentric Background No Black
Source GDJ
Dark blue concrete wall with some small dust spots.
Source Atle Mo
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Here's a brown background pattern with subtle stripes. I hope you'll like the color. If not, feel free to change it using an image editor, if you know how of course. Personally, I'm using GIMP to create these backgrounds.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A classic dark tile for a bit of vintage darkness.
Source Listvetra