Low Centerpieces

I am having a small wedding reception for 70 in a gorgeous restaurant instead of a hall and I need some ideas for low centerpieces that can be placed around a large U shaped dining table. The interior of the restaurant is one room with exposed brick walls, ivy crawling on one of the walls, an ivory booth running along that same wall, ivory sailcloth draped from the ceiling, white linens and candles...any ideas???

Thanks!!!