Tired of centerpieces or favors that you have to worry about breaking? Try using rocks. Yes rocks. Sets of rocks are available that you can write on. You can put the date one, the word 'Love' or other appropriate 'wedding type word'. You can stack them or use stones are part of a Zen design with some pillar candles.
You can purchase these rocks at http://www.stonedecorative.com/. Photos courtesy of stonedecorative.com.