A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Traced from a drawing in 'Household Stories from the Collection of the Brothers Grimm', Wilhelm Carl Grimm , 1882.
Source Firkin
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
A rusty grunge background for websites. Feel free to use it in your site's theme.
Source V. Hartikainen
Geometric triangles seem to be quite hot these days.
Source Pixeden
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
A pattern drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Zero CC tileable Laminate wood texture, photographed and made by me. CC0
Source Sojan Janso
Abstract Tiled Background Extended 8
Source GDJ
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A free seamless background with pink spots.
Source V. Hartikainen
Prismatic Groovy Concentric Background 4
Source GDJ
This one has rusty dark brown texture.
Source V. Hartikainen
Here's an yet another seamless note paper texture for use as a background on websites.
Source V. Hartikainen