A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Prismatic Hypnotic Pattern No Background
Source GDJ
A yellow tiled background... Blurriness, bokeh effect and rectangles pattern in one mix.
Source V. Hartikainen
Black brick wall pattern. Brick your site up!
Source Alex Parker
Prismatic Triangular Background Design Mark II 5
Source GDJ
The following orange background pattern resembles a honeycomb.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua