The first step is to match the colours with the stages of grief.
Stage 1 - Shock and Disbelief - Orange
Stage 2 - Denial - Yellow
Stage 3 - Anger - Red
Stage 4 - Bargaining - Purple
Stage 5 - Guilt - Dark Blue
Stage 6 – Depression - Black
Stage 7 - Acceptance and Hope - Bright Green
After the visuals have been defined, using coloured markers to write (in case you are doing this for your own self) or make others write about the each stage of grief in their respective colours. There is always a situation in which a person has been through, one, many or all of the stages. Let each person write his/her own observations about each stage.
Now display the feelings of different people about one specific stage, sequence wise, and with the focus on what went wrong where, so that a subliminal message can be propagated to make the mind strong.