For my son Kyle's 4th Birthday we had to do Batman.  We made our invitations on the computer and they looked like they were a comic book page.  The kids were all given Batman capes and masks for their favors.  We made the capes by choosing a fabric that you can cut out and not worry about it unraveling. We cut them out and added Velcro closures at the neck.  they all ran around like Batman and loved their capes. (this was really easy, we had to make 28 of them)  I gathered all the children to sit down and then entered our hired Batman!  They all cheered. He did a show taught them crime fighting moves and gave each one a bat ring.  I took each child's picture with him and then sent them in their Thank you cards. When Batman left we had cake and ice cream and then opened the gifts. As the parents came we gave everyone a bat shaped decorated cookie wrapped in cellophane.  This was a Fabulous party and my son still cannot believe that Batman actually came to his house!