Floating Flower Tip - Most flowers float pretty well on their own until they start to pool with water and slowly sink. For a longer lasting centerpiece, use bubble wrap to make little skirts for your flowers.
DIY Wedding Ideas: 10 Ways to Save Budget for Your Big Day
If you are inviting kids. I like these ideas: -A kid drink for the toast (like cookies and milk) -Activity sheets/placemats/crayons -Legos/playdoh -Hire "babysitter" like a 13 yr old cousin -Kids open candy/snack bar