I have a book of birthday ideas for boys. It has suggestions for themes, games, decorations, food, songs to play or sing. A lot of the idea can apply to girls parties too but girls are less enthusiastic about building forts or shooting blow guns.
I have used the book to throw my son several successful birthday parties. Him and his friends are always entertained and we spend a lot less money than we would if we took them all to the movies or the batting cages.