This one started on a visit to the CCB in Lisbon with my wife, where we saw some azulejos, the painted tiles you find all over the city. I wanted to see if I could make a generator that paints a new one every time, and then shows how it looks on a wall.
Press New tile, or the space bar, for a new one, and switch to Wall to see it repeated. It’s nicer on its own page, where the tile gets the whole screen. There, each tile’s number goes in the address, so you can share one you like.