Make buttercream transfer. Tape parchment paper strip template to surface.
Prepare five decorating bags with tip 2. Fill separately with dark pink, light blue, dark teal, medium teal and yellow icing.
Alternating colors, pipe random shapes on parchment paper template, excluding the extra inch on both ends of strip.
Freeze template until buttercream is set, about 20 minutes.
Once set, remove template from freezer. Working quickly, use spatula to ice light pink icing evenly over strip, about ¼ in. to ½ in. thick. Be careful not to push the icing down too hard, as that could smear the shapes on the template.
Return template to freezer, letting it chill for 5 to 8 minutes. The icing should be set, but not completely frozen.