I'm amazed at the longevity of the Peter Pan collar trend, though I totally get it...an embellished collar takes a simple round neckline from weekend-end-at-the-ballpark to comfy-cozy-glam and while I love a basic staple after a while it's like all right, all ready. More than a couple white tees is puh-lenty.
I chose to embellish one of my plain white's with a paillette collar as my first summer upcycle project because a fancy display of glimmerific paillettes is exactly the sort of upcycle this girly-girl loves.
Kristina J.'s tip: If your top is stretchy make sure to buy stretch interfacing so it will give and pull with your shirt.