Tiles are generally square and indicate you limit yourself in some way. For example, black and white tiles in a bathroom ask you to eliminate (bathroom) your black and white attitude as this can affect your health (colon) and your openness to new ideas.
White tiles show that you are too much of a perfectionist. You set the bar so high that you rarely achieve your own standard. The result is to criticize yourself for this failing, rather than to accept what you did achieve. Cream is the antidote to this and indicates the need for self-acceptance.