Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Here's a tile-able wood background image for use in web design.
Source V. Hartikainen
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
A seamless textured paper for backgrounds. Colored in pale orange hues.
Source V. Hartikainen
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
Just like the black maze, only in light gray. Duh.
Source Peax
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin