Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Colour version of the original pattern inspired by the front cover of 'Old and New Paris', Henry Edwards, 1894.
Source Firkin
Seamless Light Background Texture.
Source V. Hartikainen
A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Prismatic Abstract Background Design No Black
Source GDJ
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Prismatic Abstract Geometric Background 3
Source GDJ
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
From a drawing in 'Danmarks Riges Historie af J. Steenstrup, Kr. Erslev, A. Heise, V. Mollerup, J. A. Fridericia, E. Holm, A. D. Jørgensen', 1897.
Source Firkin
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Classic 45-degree pattern, light version.
Source Luke McDonald
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Classic vertical lines, in all its subtlety.
Source Cody L
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.