Using accordion folded money and pipe cleaners (light green thin Japanese ones from BFC) I tied rosette bills back to back onto the lei. Of course you could just accordion fold wide ribbon but most graduates appreciate a bit of cash. Dressing up a pre-made lei is super easy and at least conveys the feeling that you took the time to make something special and handcrafted.
Even if you don't have much time for lei making, you can easily make single crocheted leis or embellish store bought leis. You can learn from BFC employees and use up the yarn you've been hoarding....LOL! Wishing lei love to all 2015 graduates!