The last one to stick around is the winner. For a medieval-themed party, decorate triangular party hats that have ribbons or streamers flowing from the point. Decorations: Decorations set the mood. Log in Sign up Pinterest The worlds catalog of ideas Search . Each guest starts out by standing on one of the pictures. The Cake: The grand finale. Princess birthday party theme Nothing could be more fun than a girl-y princess party with sparkles, tulle skirts and, of course, who could forget the tiara! Colour scheme: Pink and silver Recommended age group: 5-7 year olds, but it can be adapted for other ages Guest list: 6-8 kids Invitations Set the tone for the party with a spectacular Princess Gift Box invitation.