A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
Prismatic Hypnotic Pattern No Background
Source GDJ
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
A light gray background pattern with seamless fabric-like texture and almost unnoticeable stripes.
Source V. Hartikainen
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
Someone was asking about how to achieve a fur pattern at #inkscape irc so tried to make a filter on it. Flood filled fractal noises rigged together. May someone find a good use for these.
Source Lazur URH
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
Drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media