I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
An alternative colour scheme to the original seamless pattern.
Source Firkin
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Sort of reminds me of those old house wallpapers.
Source Tish
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
A seamless paper background colored in pale yellow.
Source V. Hartikainen
This was submitted in a beige color, hence the name. Now it’s a gray paper pattern.
Source Konstantin Ivanov
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
The image is a seamless pattern which is derived from a vine .Consequently, the vine got like dots via vectorization.The original vine is here:jp.pinterest.com/pin/500744052301410188/
Source Yamachem
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
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
From a drawing in 'Hubert Montreuil, or the Huguenot and the Dragoon', Francisca Ouvry, 1873.
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
A seamless pattern formed from a tile made from ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin