Sort of reminds me of those old house wallpapers.
Source Tish
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
An alternative colour scheme to the original seamless pattern.
Source Firkin
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
This one needs to be used in small areas; you can see it repeat.
Source Luca
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
This is the remix of an Openclipart clipart called "Maze" uploaded by "any_ono_mous".Thanks.This is a seamless pattern of a maze.
Source Yamachem
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Prismatic Groovy Concentric Background 2
Source GDJ
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin