Weddingbee boards

Hello bees! I seriously need your help.  I can't seem to decide on decor for our reception.  I think i've looked at a million inspiration pics that I like, which leaves me even more confused.  Our colors are gray, mustard yellow, white/ivory. Below is a pic of our reception hall

We are going to have ivory pintuck linens, gray napkins, mahoghany chivari chairs and amber uplighting.  The part I can't figure out is the centerpieces.  To cut on flower costs, i wanted to do half the tables with the o so famous candle lanterns from Ikea (see below) with two small arrangements on either side.   but I can't figure out what color of flowers to use...White flowers? Yellow? Mixture of both? I also need help figuring out what to do with the other half of the tables.  We don't really have a theme, but I want sort of a modern, fresh, clean, simple, but elegant look to the wedding. Any ideas you guys have would be greatly appreciated.  Please help!!!!!! Thank you!