Dip and decorate pretzels. Dip 3/4 length of pretzel rods in melted blue candy and tap to smooth and remove excess candy. Chill on parchment-covered cake board until set, about 10 to 15 minutes. Use white candy to drizzle 1/4 of end of pretzel.
Immediately sprinkle with white sparkling sugars. Chill on parchment-covered cake board until firm, about 5 to 10 minutes.