Some sleepover themes for a boy's party are "Scooby-Doo," "Star Wars," super heroes such as Batman or The Avengers, Harry Potter and sports, such as baseball, football or soccer. Another idea is to base the party's theme off a movie that the party goers will watch, such as "Cars," "How to Train Your Dragon" or "The LEGO Movie."
A LEGO-themed party could have LEGO building activities where each boy builds the same thing using his own creativity. For a bowling or racing party, the party goers can use a car to knock down bowling pins. A football party can incorporate tag football or the boys can make paper footballs to play tabletop games.