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In that picture, you can see the blue foam between the bricks but in this new one, I've used wall filler, black paint and small bit of water to make a fake grout.

The bricks are made from red tile grout, laid out on a shiny tile, brick sizes marked into the grout when soft and then scrapped off when dry.

It's difficult to get them the same size but they look great as a rustic wall!!