AThe blue looks like frosting a little bit IMO. Either that or it would just be the patience of doing layer after layer of candy melts. HTH
Looks like it was done with a squeeze bottle after the pops were dipped.
I also think it was spread on with a small knife. It wouldn't be difficult to do as long as you let the melts cool down quite a bit so they aren't runny.
AYou can also use a toothpick to dab/spread thick chocolate/candy melts & top with sprinkles. It will dry quickly. Toothpicks are my best friend! Lol!
Yeah or just put the thickened melts in a bag, pipe it on around the stick, then use your toothpick or small spatula to swirl it around. I don't think it would take that much time at all.