A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
A classic dark tile for a bit of vintage darkness.
Source Listvetra
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
The following orange background pattern resembles a honeycomb.
Source V. Hartikainen
Colour version of the original seamless pattern.
Source Firkin
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
This background pattern contains worn out colorful stripes as a texture.
Source V. Hartikainen
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
You may use it as is, or modify it as you like.
Source V. Hartikainen
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
From a drawing in 'Real Sailor-Songs', John Ashton, 1891.
Source Firkin
A seamlessly tileable pink background texture.
Source V. Hartikainen