Retro Circles Background 7 No Black
Source GDJ
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
A set of paper filters. The base texture is generated the same way, only the compositing mode is varied.
Source Lazur URH
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A free green background pattern with a pattern of rhombuses on a seamless texture. Feel free to use it as a tiled background image on your web site.
Source V. Hartikainen
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
From a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
This one needs to be used in small areas; you can see it repeat.
Source Luca
Looks like an old rug or a computer chip.
Source Patutin Sergey
Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Here's a camo print with more tan and less green, such as might be used in a desert scenario. This is tileable, so it can be used as a wallpaper or background.
Source Eady
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin