I am doing my own centerpieces. They will be carnation flower balls. My ? is I have researched on how to do it and my FSIL has done it a lot but she is a bit busy and when I did see her I forgot to ask her, do i have to use floral balls or will styrofoam balls do the trick? We are assembling them the day before the wedding. Im not sure since its styrofoam if they will dry out and wilt early? floral balls I need are 5.99 and I need 14. A lot more then I am wanting to spend. Does anyone know the answer?