Rock star and music themed parties are very popular for tween and teen birthday celebrations, but it can sometimes be challenging to come up with decor that’s age appropriate, unique, and budget-friendly. That’s why I love this DIY monogram craft from Kojo Designs. She’s filled a cardboard letter J with tiny silver disco balls to use as the centerpiece of her party decor. Then, when the party’s done, the birthday girl gets to use the monogram to decorate her room. Click here for details.