We put out every topping possible, got glass pop bottles of old timey soda pop, and framed old pictures of the birthday players and set them around some white twinkle lights.
I found chalkboard labels and milk jugs complete with little cows on them from Michaels. Butterfingers crushed, pop rocks, pretzel bits, marshmallows, chocolate waffle cookies, tobasco chocolate, whoppers, cereal, brownies, cookie dough. You name it. We stuck it in some ice cream. No fuss. No fuss. No crazy and overwhelming party. For entertainment, I put out some old scrapbooks for us to peruse. Best. We were all giggly and mellow. Did you know you can have a 12 and 13 year old's birthday with 18 people in a small house and have mellow?
Try it people.