Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Remixed from a PNG that was uploaded to Pixabay by VictorianLady
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
Lovely pattern with splattered vintage speckles.
Source David Pomfret
Zero CC tileable pine bark texture, photographed and made by me. CC0
Source Sojan Janso
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Prismatic Abstract Geometric Background 3
Source GDJ
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
Prismatic Polka Dots 3 No Background
Source GDJ