Various lane types exist:
Lanes that are not specified any further, in all model types
Lanes for roles, only in Enterprise BPMN collaboration diagrams and Enterprise BPMN process diagrams
Lanes for organizational units, only in Enterprise BPMN collaboration diagrams and Enterprise BPMN process diagrams
Lanes for positions, only in Enterprise BPMN collaboration diagrams and Enterprise BPMN process diagrams
Lanes for groups, only in Enterprise BPMN collaboration diagrams and Enterprise BPMN process diagrams
Lanes for application system types, only in Enterprise BPMN collaboration diagrams and Enterprise BPMN process diagrams
Since lanes are object types it is impossible to change the symbol.