From a drawing in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
Abstract Tiled Background Extended 12
Source GDJ
A seamless pattern formed from miutopia's cakes on a tablecloth.
Source Firkin
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
Original seamless pattern with an Inkscape filter.
Source Firkin
Green Background Pattern
Source V. Hartikainen
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
The image depicts a shell seamless pattern.I used an OCAL clipart called "Shell" uploaded by "jgm104".Thanks.
Source Yamachem
Geometric triangles seem to be quite hot these days.
Source Pixeden
This could be a hippy vintage wallpaper.
Source Tileable Patterns
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.
Source V. Hartikainen
Prismatic Hexagonalism Pattern No Background
Source GDJ
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa