Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
Colourful background achieved with gradient fills.
Source Firkin
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Prismatic Hexagonalist Pattern No Background
Source GDJ
A bit of scratched up grayness. Always good.
Source Dmitry
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
Source Firkin
This one is quite simple in design, it consists of vertical stripes layered on top of a seamless texture.
Source V. Hartikainen
A repeating background of beige paper with vintage look. Repeats to infinity, as usual.
Source V. Hartikainen
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
This could be a hippy vintage wallpaper.
Source Tileable Patterns
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Prismatic Groovy Concentric Background No Black
Source GDJ
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
A seamless pattern drawn originally in Paint.net by distorting a slice of background pattern 116 and copying the resulting triangle numerous times.
Source Firkin
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem