Dodecagons, squares and triangles.

This is analogous to using octagons and square, the famous linoleum tile pattern, but dodecagons when lined up north/south/east/west leave a gap filled by triangles and squares, not just a simple square.

The same idea with the squares removed, which makes it a little hard to line the triangles up neatly. Without magnetized backs, these shapes can be very delicate to work with, and lining things up perfectly becomes more of a challenge.