M.R.
For my son's 1st Communion, I made cross shaped sugar cookies on a stick, put them in baggies and tied the baggie shut with a twist tie and attached a tag with my son's name and the date (Best Rolled Sugar Cookie recipe on Allrecipes.com). I couldn't find a pretty cross shaped cookie cutter in the store so I ordered one online. I decorated them with white and light blue icing and added sprinkles to some of them. Every 10 cookies were decorated differently. I then took square shaped vases (about 3-4 inches tall - Michaels or Walmart), put a cone shaped, styrofoam piece in the middle, filled the vase with blue colored stones/jewels. Then I inserted the cookies into the styrofoam, staggering them like a cookie bouquet. I bought balloons which I attached to each vase and used the cookie vases to double as centerpieces on the tables and then let everyone know to take a cookie before they left.
For my daughter I did the same vase idea but instead I made cross shaped, chocolates (white and milk chocolate) on a stick. Bought the cross molds at Hobby Lobby.
Everyone loved both of the items and loved the centerpieces.
I am already thinking of what to do for my next one's 1st Communion which is 2 years away but I think I might make small loaves of bread and put them in pretty baskets as a centerpieces. 1st Communion is about breaking bread so I think it will tie nicely. Good Luck