Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Feel free to download this "Dark Wood" background texture for your web site. The background tiles seamlessly!
Source V. Hartikainen
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
A seamless light gray paper texture with horizontal double lines.
Source V. Hartikainen
Tiny little flowers growing on your screen. Nice, huh?
Source Themes Tube
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
A bit strange this one, but nice at the same time.
Source Diogo Silva
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
A seamless pattern drawn originally in Paint.net by distorting a slice of background pattern 116 and copying the resulting triangle numerous times.
Source Firkin
A seamless pattern created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
Gold Triangular Seamless Pattern No Background
Source GDJ
Embossed lines and squares with subtle highlights.
Source Alex Parker