From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'Two Women in the Klondike', Mary Hitchcock, 1899.
Source Firkin
A seamless pattern formed from miutopia mug remixes on a tablecloth.
Source Firkin
Prismatic Geometric Tessellation Pattern 4 No Background
Source GDJ
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
A seamless pattern formed from background pattern 102
Source Firkin
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
A pale olive green background with a seamless texture.
Source V. Hartikainen
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Basket Fibers, Basket Texture, Braid Background style CC0 texture.
Source 1A-Photoshop
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
Prismatic 3D Isometric Tessellation Pattern 6
Source GDJ