mapped a black sq and it seems that you can control how many black sqs appear in this case 2 x 2 but there seems to be no way of creating a space between them....i can't believe, there is no feature to do this
an example would be a wallpaper for instance with a plain colour and a map of a sq to create a mosaic over this surface with a 2mm gap to appear as a grout line
i have looked high and low to see if there is a setting but can't find one