Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
Continuing the geometric trend, here is one more.
Source Mike Warner
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
The image is a design of blue glass.How about using it as background image?
Source Yamachem
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas