From drawing in 'Musings in Maoriland', Thomas Bracken, 1890.
Source Firkin
Background pattern originally a PNG drawn in Paint.net
Source Firkin
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
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
The image is a seamless pattern which is derived from a vine .Consequently, the vine got like dots via vectorization.The original vine is here:jp.pinterest.com/pin/500744052301410188/
Source Yamachem
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
A seamless gray background texture suitable for use on websites. To me, it has the look of stone. Feel free to modify it to meet your needs (by making it a bit lighter or darker, for example).
Source V. Hartikainen
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Prismatic Geometric Pattern Background 2
Source GDJ
This is a grid, only it’s noisy. You know. Reminds you of those printed grids you draw on.
Source Vectorpile
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
A cute x, if you need that sort of thing.
Source Juan Scrocchi
Zero CC asphalt, pavement, texture, photographed and made by me. CC0 WARNING I FOUND A SEAM ON THIS TEXTURE
Source Sojan Janso
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A pattern derived from repeating unit cells each derived from part of a mosaic in paint.net. The starting point for the mosaic was a picture of some prawns!
Source Firkin