Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
Colourful background achieved with gradient fills.
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a tile that can be had 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
This is a seamless pattern which is derived from a flower petal image.
Source Yamachem
Geometric triangles seem to be quite hot these days.
Source Pixeden
The original has been presented as black on transparent and stored in the pattern definitions. To retrieve the unit tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
The image is the remix of "wire-mesh fence seamless pattern" .This is a more minute version of it.Sorry for the file size.Using path>difference in Inkscape, I will cut out any silhouette from this pattern and create a "meshed silhouette".
Source Yamachem
Prismatic Groovy Concentric Background 3
Source GDJ
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
Prismatic Floral Background No Black
Source GDJ
Prismatic Groovy Concentric Background
Source GDJ
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
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
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen