Yard fillers are items that can be used to decorate a yard or garden. The term 'yard fillers' can refer to a variety of items, such as plants, statues, and other decorations. One example of a yard filler is ALES, which is an acronym for Annuals, Lilies, Evergreens, and Shrubs. These four types of plants are often used to fill in a yard or garden, providing color and texture to the landscape.