Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Colorful Floral Background 3 No Black
Source GDJ
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Colour version of the original pattern.
Source Firkin
Colour version of the original pattern inspired by the front cover of 'Old and New Paris', Henry Edwards, 1894.
Source Firkin
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
Formed by distorting an image on Pixabay that was uploaded by gustavorezende. To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A chequerboard pattern with a fruit theme. The fruits are from a posting by inkscapeforum.it.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Remixed from a drawing in 'A Girl in Ten Thousand', Elizabeth Meade, 1896.
Source Firkin
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen