Here is a resource that I made for my First Holy Communion Class.
I gave each of the children a customized boy or girl bookmark with their name, date of communion and teacher name as a memento. I accompanied these with a set of rosary beads for each child (compliments of my local Legion of Mary).
I saved them as a PDF and printed back to back. I them laminated them and gave them to each of the children on the morning of the ceremony while wishing them luck!