The best part of doing a First Communion or a Confirmation party is that you can do whatever you want. Literally, the sky is the limit!! I say this: make it personal, and you'll have a winner. Think about the guest of honor, and you won't be able to contain your creativity!!
For example--is the guest of honor a boy or girl scout? Do they love to camp? Maybe the above Smores in a jar would serve as a great dessert or take home party favor. You can find the information on how to make them here.
Instead of doing cupcakes, consider Push-Up Pops! They're fun, make a great display, and are easy to create. Check out this book on Amazon--you'll head will explode with ideas!
These can be found here.found here.
And the plastic push pops can be found here.
find them here.
You can use simple glass vases for centerpieces. They're beautiful in their own right.
Maybe do a fondue bar--kids love those! I love how these apple slices on sticks seem to scream, "PARTY!"more info here on the candy cart.)
You can view my past First Commuion post for my daughter here, and the party for my son here.
Enjoy your day!!