When my daughter married we put various small photos of the bride or groom from when they were little up to present day on the tables as part of the center pieces. On a long table you could put a few down each table. It was a good conversation starter and encouraged people to mingle to see the photos on other tables.
On the guest book table we had a wedding photo of each set of parents and on the gifts table was a wedding photo of each set of grandparents.
People really seemed to enjoy seeing the couple’s history in this way.
After the wedding we gave the frames from the guest tables to friends who had helped with the wedding, and gave the grandparents the frames we used on their photos. We kept a few of the guest table frames for the bride and groom.
I don’t know what it would cost this time of year (my daughter was married in summer and we had several lavender farms close by) but we filled little violet draw string sheer bags with lavender buds and passed those out for people to throw in place of rice when the bride and groom left.
Good luck, and don’t work so hard you are too tired to enjoy the day!