Out of my ideas, the one the stuck with me the most was the one in relation to Divorce rates in families.
Initially, how I feel this could be represented is with houses that are made of blocks/lego. Each house represents a year or an average over a certain time-period. These houses would be arranged in a row or in like a clustered housing estate layout.
The amount of damage done to the house represents the Divorce % of that given time-period, i.e the more damage done to the house, the higher the %. This can be achieved by having parts of the house glued together and if the user hits the house with, for example, ball, the unattached parts would fall off – representing the Divorce % and how it damages homes in a metaphorical manner.