Decor is for adding context to the rest of your furniture. Items are placed on shelves, tables, walls, to give the space a thematic feel, and to provide beauty, comfort, and sometimes functionality.
Use carved wooden bowls to serve bread, but leave them on a table with crystals to create a permanent centerpiece with sparkle and an organic feel. Place small statues on shelves, either as showpieces, or as book stops. My advice - buy what you love. It will find a home.