Step away from the standard platonic solid polygons for something truly different. This set of 2 dice includes a uniquely shaped black 2-sided die, and a white 4-sided die. This is a d4 that actually rolls, and doesn't act like a weapon when left on the floor to be stepped on.
Both of these dice have the same curved cube shape, giving four total sides on each die. The d2 version includes the number 1 twice and the number 2 twice.