A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Sharp but soft triangles in light shades of gray.
Source Pixeden
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
The following orange background pattern resembles a honeycomb.
Source V. Hartikainen
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
ZeroCC tileable mossy (lichen) stone texture, edited from pixabay. CC0
Source Sojan Janso
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A repeating graphic with ancient pattern. I came up with this name/title at last minute, so you may find that there is very little of ancientness in this pattern after all.
Source V. Hartikainen
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Inspired by a drawing seen in 'City of Liverpool', James Picton, 1883.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
From a drawing in 'A Guide to the Guildhall of the City of London', John Baddeley, 1898.
Source Firkin
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
This is sort of fresh, but still feels a bit old school.
Source Martuchox
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The original enhanced with one of Inkscapes's filters.
Source Firkin
A repeating background for websites with a texture of black groove stripes.
Source V. Hartikainen
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight