As a start, I made this simple mobile to hang above the table. I found the inspiration here, but since I don't have a sewing machine, I just made felt hearts. Here's what you need:
Twine (or ribbon)
Stiffened felt (or two layers or regular felt glued together)
Glue gun, craft glue or double-sided tape (optional)
Washi tape (optional)
Cut several hearts from stiffened felt in a variety of colors and sizes. Use more felt and/or washi tape to embellish hearts.