To create this glass-free centerpiece, start with four blocks of florist foam that have been soaked in water overnight. Group the foam blocks on a round platter, trim the edges to form a round shape, and then hold them together with florist tape. One by one, loop live English ivy vines around the florist foam. Lastly, fill the top with stems of white hydrangeas and 'Polo' roses stuck directly into the foam. Best news: It'll last for days!