Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
Background formed from the original with an emboss effect
Source GDJ
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A free seamless background image with abstract texture of green "curtain".
Source V. Hartikainen
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Seamless pattern inspired by a drawing on Pixabay. To get the tile this is formed from, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Inspired by a pattern found in 'A General History of Hampshire, or the County of Southampton, including the Isle of Wight', Bernard Woodwood, 1861
Source Firkin
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Colourful background achieved with gradient fills.
Source Firkin
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Turn your site into a dragon with this great scale pattern.
Source Alex Parker