If you like yema balls and you want to give away boxes of them for Christmas gifts, you can turn plain yema balls into festive eye candy in two ways.
1. Add a few drops of food color and flavor extracts (like pandan and melon); or
2. Roll the yema balls in colored sugar crystals.
If you’re curious about colored sugar, I buy mine from Living Well (Wilton brand). They’re pretty inexpensive but if you really want to cut on the cost, you can make your own by following the instructions here, here or here.