In iCollections you can assign a custom icon to any item in a Collection. The custom icon can be assigned to files, folders and aliases. To change the icon right click on the item and select "Set Custom Icon":
To remove previously assigned custom icon and revert back to the standard icon, click "Remove custom icon" in the file selecting panel:
How to set and reset the custom icon:
To change Trash icon, go the Setttings -> Items and click "Set..." trash icon option.