Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Prismatic Geometric Pattern Background No Black
Source GDJ
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
Subtle scratches on a light gray background.
Source Andrey Ovcharov
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
This one needs to be used in small areas; you can see it repeat.
Source Luca
From a drawing in 'Kingsdene', Maria Fetherstonehaugh, 1878.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
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
This beige background pattern resembles a concrete wall with engravings or something similar to it.
Source V. Hartikainen
A cute x, if you need that sort of thing.
Source Juan Scrocchi
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
You know, tiny and sharp. I’m sure you’ll find a use for it.
Source Atle Mo
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin