Embossed lines and squares with subtle highlights.
Source Alex Parker
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A seamless background tile of aged paper with shabby look.
Source V. Hartikainen
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Retro Circles Background 5 No Black
Source GDJ
A free seamless background with pink spots.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Number five from the same submitter, makes my job easy.
Source Dima Shiper
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Dark blue concrete wall with some small dust spots.
Source Atle Mo