Prismatic Curved Diamond Pattern No Background
Source GDJ
A dark striped seamless pattern suitable for use as a background on websites.
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
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
A free background image with a seamless texture of cardboard. This texture of cardboard looks quite realistic, especially when is actually tiled.
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Here's a subtle marble-like background for use on websites.
Source V. Hartikainen
Prismatic Abstract Background Design No Black
Source GDJ
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
Source Firkin
Prismatic Groovy Concentric Background
Source GDJ
From a drawing in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
A bit strange this one, but nice at the same time.
Source Diogo Silva
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
Abstract Tiled Background Extended 10
Source GDJ
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin