Lately I've been seeing some awesome ideas for Guest Book Alternatives that are a little more useful than the traditional guest book. The one my fiance and I liked best was where you have polished rocks for everyone to sign and then you put them in a fancy vase an then you can use it as a decoration in your new home. Only problem is I'm having a hard time finding rocks big enough! Has anyone else used this idea? Where did you get yours? Any ideas would be greatly appreciated!