From a drawing in 'Hundert Jahre in Wort und Bild', S. Stefan, 1899.
Source Firkin
Seamless Olive Green Web Background Image
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Prismatic Polka Dots 3 No Background
Source GDJ
Colorful Floral Background 3 No Black
Source GDJ
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
I have no idea how to describe this one, but it’s light and delicate.
Source JBasoo
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Number five from the same submitter, makes my job easy.
Source Dima Shiper
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Prismatic Groovy Concentric Background 2
Source GDJ
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin