Combine white candy melts with blue candy melts in a microwave-safe bowl. Microwave according to the package directions. Transfer the candy to a squeeze bottle or place it in a ziplock bag and snip off a corner. Pipe two pairs of ears and two trunks, about 2 1/2 inches long onto the parchment lined baking sheet. To smooth the surface of the shapes, snip a small square of parchment paper, lay it on top of the candy, then gently pat the paper in place until the candy is slightly flattened. Let the candy set, then peel away the paper. Repeat with the remaining candy until you've piped 24 ears and 12 trunks. Meanwhile, in a small bowl, tint vanilla frosting with blue food coloring. Working with one cupcake at a time, apply a generous layer of frosting. Press on a candy trunk and ears, mini chocolate chip eyes, and licorice pastel tusks.