Centerpieces too small??

That should be fine. If you want it to take up more space you can put it on a mirror and add votives. But remember you'll also have 3 glasses per setting (wine/water/champagne), bread plate (possibly), the favor, escort card, and table # taking of up space. If you have wine or water on the table that will crowd it as well. Also, 10 is more comfortable at a 72" round. 8 is better at a 60.

Our centerpieces were small as well. We covered the space with a runner and had charger plates. It was simple, but we got alot of compliments on it. I do think 1 5in item is a bit too small though. Maybe some candles on each side?

Depends on how many people your going to have at each table. A smaller table could be your answer.

http://www.just4uweddingservices.com/Shopping.html

Thanks ladies! I wanted to seat 10 people per table because that cuts down on how many centerpieces we have to pay for. There will be four votive candles at each table and our venue offers the mirrors as well.

Rose petals may help take up some space as well...