CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A chequerboard pattern with a fruit theme. The fruits are from a posting by inkscapeforum.it.
Source Firkin
A background pattern with green vertical stripes. A new striped background pattern. This time a green one.
Source V. Hartikainen
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
A green background pattern with warped vertical stripes and a grunge look.
Source V. Hartikainen
Seamless Olive Green Web Background Image
Source V. Hartikainen
This is the remix of "Colorful Floral Pattern Background 3" uploaded by "GDJ". Thanks.
Source Yamachem
A seamless pattern based on a tile that can be achieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A yellow tiled background... Blurriness, bokeh effect and rectangles pattern in one mix.
Source V. Hartikainen
"Beige Stone", Tileable Texture.
Source V. Hartikainen
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
Psychedelic Geometric Background No Black
Source GDJ
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Vector version of a JPG that was uploaded to Pixabay by theasad121
Source Firkin
From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin
A pattern formed from repeated instances of corner decoration 8. To get the basic tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Prismatic Groovy Concentric Background 5
Source GDJ
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ