From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Looks like an old rug or a computer chip.
Source Patutin Sergey
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Remixed from a drawing in 'Jezebel's Daughter', Wilkie Collins 1880
Source Firkin
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo
From a drawing in 'Picturesque New Guinea', J Lindt, 1887.
Source Firkin
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
From a drawing in 'An Old Maid's Love. A Dutch tale told in English', Maarten Maartens, 1891.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless pattern based on a rectangular tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Retro Circles Background 8 No Black
Source GDJ
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
ZeroCC tileable stone texture, edited from pixabay, CC0
Source Sojan Janso
The image depicts a seamless pattern of a snow crystal.I referred to a book called ”sekka-zusetsu” or "雪華図説" which means an illustrated explanation about snow crystals.This book was published in 1832 (天保3年) or Edo period.For more about "雪華図説",see here:dl.ndl.go.jp/info:ndljp/pid/2536975
Source Yamachem
Prismatic 3D Isometric Tessellation Pattern 6
Source GDJ
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin