Yes! Any decorations or other Bookshelf Items that have been added to your Bookshelf Inventory can be removed from the Bookshelf Inventory through the Bookshelf feature itself. Just click on the item you want to remove, then click "Remove" and the item will go back to your Inventory. Depending on if the item is NP or NC, it will go back to the appropriate inventory, so if you don’t see the item please check both inventories before sending a CS ticket.