It's as easy as ABC to plan a party using the initial of the birthday child.
Martha Stewart Kids, Volume 17 2005
Have kids cut out and decorate card-stock letters for invitations.
Rubber-stamp a border on a paper tablecloth and hang card-stock initials like streamers (print out letters from your computer to trace).
Adorn cupcakes with monogrammed cookies. Create "name-brand" drinks by coloring in a stencil on patterned paper in marker (affix with double-sided tape).
Set out boxes, filled with rubber stamps and stationery. Mark the top of each box with the stenciled initial of each guest. You can also decorate t-shirts with each guest's initial using iron-on transfer paper for ink-jet printers; follow the package instructions.