Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A seamless pattern formed from a rectangular tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A seamless web texture of "green stone".
Source V. Hartikainen
Subtle scratches on a light gray background.
Source Andrey Ovcharov
A free background pattern with abstract green tiles.
Source V. Hartikainen
A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Chevrons Pattern 5 With Background
Source GDJ
A white version of the very popular linen pattern.
Source Ant Ekşiler
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I. A version of the original with random colors.
Source Firkin