Hi cole379, I made changes to my centerpieces (actually I asked for a much different variation of them) and they were able to fulfill my requests. This was at ERC and there is a different WC there now, but I would make sure that you're crystal clear (pics when possible) as well as explicit instructions about what you want. If there are extra charges I would suggest you request that they outline those for you so there aren't any surprises. It really depends on the WC when it comes to swapping out items/making substitutions, but being as clear as possible is key. There's also always the option of going with an outside event planning company/florist who can make the arrangements, but obviously that would be at an additional cost, completely separate from your package. Hope that helps and good luck!