Object lists have the same basic structure as hierarchical-sequential lists. The list body, however, can be vary from list to list and within a list from group to group and can overall be very irregular.
For this reason, there can be no binding rules only general recommendations for the design of object lists.
First, identify the individual information types in the list and color them according to the rules. If this proves unsatisfactory, change the basic model until you find a more aesthetically pleasing design.