Classic tiles from Harlinger, Friesland, The Netherlands. Various shades of faint blue tiles, with a hint of gold, that look to be white at a casual glance:
Extremely popular in Holland, they even make a wallpaper replica of Friese Witjes:
A more detailed view here:
Handmade square tiles: 13 cm x 13 cm, ~8mm thick. 60 pieces per square meter.
Tiles should be placed in the traditional old way: as close as possible together with a maximum 1 millimeter narrow joint.
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In production since 1598, these tiles are still made daily using fine marine clay in the same fashion as 400 years ago: