From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
This texture looks like old leather. It should look great as a background on web pages.
Source V. Hartikainen
Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
I’m starting to think I have a concrete wall fetish.
Source Atle Mo
The image depicts an edo-era pattern called "same-komon" or "鮫小紋"which looks like a shark skin.The "same" in Japanese means shark in English.
Source Yamachem
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
Prismatic Groovy Concentric Background No Black
Source GDJ
Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin
Prismatic Geometric Pattern Background
Source GDJ
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Prismatic Hexagonalism Pattern No Background
Source GDJ
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard