From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
Remixed from a PNG that was uploaded to Pixabay by VictorianLady
Source Firkin
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
Green Web Background, Seamless tile.
Source V. Hartikainen
Remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
The image depicts polka dot seamless pattern.
Source Yamachem
This one needs to be used in small areas; you can see it repeat.
Source Luca
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Just like the black maze, only in light gray. Duh.
Source Peax
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
CC0 and seamless wellington boot pattern.
Source SliverKnight
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo