This filter creates a checkerboard pattern replacing the current layer
content. Colors used for pattern are current Fore- and Back ground
colors of toolbox.
If the image is in indexed mode, this menu entry is disabled.
This filter is found in the main menu under
Filters → Render → Pattern → Checkerboard (legacy)….
Size
With this option, you can set checkerboard square size, in
pixels, or in your chosen unit by using the drop-down list.
Psychobilly
This option gives an eiderdown look to the Checkerboard.