If your birthday boy or girl is nostalgic for the good old days of poodle skirts, beach blanket bingo or the fab four, you can easily turn a fascination with the past into a party theme. Use old movie posters, images of iconic movie stars and era specific music to put some sizzle into a teen's birthday celebration. Make the proceedings a costume party, and have guests come as someone recognizable from the target era. Offer prizes for the most creative costumes. Have classic movies playing on your big screen, or host a not-so-current events trivia game. You're bound to find something fun and funny to showcase whether you're spoofing the 40s, 50s, 60s, 70s or later. Planning a 1960s party? Why not serve a Flower Power Cake or two. They're fun, friendly and easy to make.