It's common to toss petals, birdseed or blow bubbles as the newlyweds leave the ceremony. Many of you may remember that rice was originally tossed, a traditional symbol of prosperity, but since learning that rice is harmful to birds, many couples provide birdseed for guests to toss instead.
When deciding what you want your guests to toss, think about the season or theme of your wedding. For a spring wedding have guests toss petals or flower heads with the stems cut off. In the summertime hand out sparklers and matches. Colorful autumn leaves are perfect for a fall ceremony, and you can make your own (paper) snowflakes for a winter wedding.
In lieu of a traditional toss, you can supply small bells for guests to ring, bubbles to blow or streamers and flags for them to wave. Whatever you decide to use, place them in paper cones or glassine envelopes, and have them distributed to guests as they enter the ceremony site.
You can personalize the toss holder by sealing them with a monogrammed sticker or write a note explaining to guests what they should do with the package - to toss them while you make your way up the aisle or hold onto them until you leave the ceremony site.