Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Groovy Concentric Background No Black
Source GDJ
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
You know you love wood patterns, so here’s one more.
Source Richard Tabor
The edges of all the red objects line up either vertically or horizontally, but it doesn't appear so. Made from a square tile that can be got by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A browner version of the original weathered fence texture.
Source Firkin