Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
This background texture resembles stone. It may be used as a background on web pages or on some of their html elements (header, borders, menu bar, etc.). Just modify it for your needs.
Source V. Hartikainen
There are many carbon patterns, but this one is tiny.
Source Designova
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
This background image is great for using in web design or graphic design projects. And don't forget to visit the homepage. I frequently update this resource with fresh tileable backgrounds.
Source V. Hartikainen
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Remixed from a drawing in 'Incidents on a Journey through Nubia to Darfoor', F. Ensor, 1891.
Source Firkin
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Here is a new seamless wood texture for using as blog or website backgrounds.
Source V. Hartikainen
Looks like an old rug or a computer chip.
Source Patutin Sergey
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
I’m starting to think I have a concrete wall fetish.
Source Atle Mo
Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
Number 4 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
This is so subtle you need to bring your magnifier!
Source Carlos Valdez