Use a cake stand for this! Love pillar candles grouped like this. You could put pink and purple ribbons around them as an advent wreath and then switch to a berry wreath and greenery or red ribbons at Christmas.
Quick centerpiece: Arrange ornaments in a square vase. Tie a bow around the vase and display on a silver tray, blanketed with artificial snow and+a few extra ornaments. Coordinate the color of the ornaments with your table and holiday decor.