Can anyone give me some pointers on DIY flowers?? I have reluctantly decided to take on the task of centerpieces....something I may regret, but really know absolutly nothing about flowers! We are using galvinized metal vases for them and the plan (as of now at least) is to buy a bunch of potted flowers at a nursery and re-pot them in my vases. I was orginally thinking I would do mainly mums since it is a fall wedding and they are a very popular fall flower. Does this sound like something that would be doable??? How long can I do something like this ahead of time?? Also, for non potted flowers, how long do those last?