I found my favorite D.I.Y. wine bottle project on Bellalimento.com. All you'll need are a few wine bottles, some chalkboard paint, and a few inexpensive daisies for an awesome vintage look. I also love the idea of roses in these.
To show guests the table number you can group bottles together, corking one and placing a small card on top. And if you're using chalkboard paint, you can easily write the table number and guests directly onto the bottle.