Classic 45-degree pattern, light version.
Source Luke McDonald
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Drawn in Paint.net and vectorised in Vector Magic
Source Firkin
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Formed by distorting a JPG from PublicDomainPictures
Source Firkin