A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
Retro Circles Background 7 No Black
Source GDJ
From a drawing in 'Kingsdene', Maria Fetherstonehaugh, 1878.
Source Firkin
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
Sharp pixel pattern, just like the good old days.
Source Paridhi
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
A textured blue background pattern with vertical stripes.
Source V. Hartikainen
A seamless background of warped stripes on paper.
Source V. Hartikainen
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Used a cherry by doctormo to make this seamless pattern
Source Firkin
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The tile can be had by selecting the rectangle in Inkscape and using shift+alt+i. Remixed from a drawing in 'Flowers of Song', Frederick Weatherly, 1895.
Source Firkin
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin