Having Custom named Lists that allow a shop owner to separate their items based on shared theme.
Create a Custom List (Example: "Furniture" Folder) Allow shop owner to check box any item they sell as Furniture. Add a thumbnail for the Group. This is very similar to Youtube when you upload a video you can check box it to be in a particular playlist.
Allows shoppers to navigate the shop more effectively by picking the Custom Categories, especially if the shop has many items covering a wide variety of things the shopper may or may not have interest in.
Examples of Custom Lists shop owners could make:
"Free Items", "Jewelry", "Makeup", "Sci Fi", "Halloween"