A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
ZeroCC tileable mossy (lichen) stone texture, edited from pixabay. CC0
Source Sojan Janso
Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin
Seamless Light Background Texture.
Source V. Hartikainen
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
The classic notebook paper with horizontal stripes.
Source Are Sundnes
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
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