This is what we did:
I had six glass globes and considered making a three-candle centerpiece for the kitchen table. Instead we made a five-candle one that can also be used on the family room coffee table and the dining room table.
The glass globes are open on the bottom. We could have just glued them onto the wood but I wanted something to raise them up a bit and hold them securely. I looked for some type of ring and found just the right size wooden round boxes at the craft store for $1 each. I thought about using only the bottom but decided to invert the lid and cut down the other piece to our desired height.