Slowly mix in the powdered sugar, 1 cup at a time, while adding a bit of the half and half or milk in between each cup. Continue to mix for 1 minute or until creamy.
Evenly divide the frosting into 6 containers. Add in one of each color of the food coloring, 1-2 drops at a time to each container. Mix until desired color is achieved.
Tear off a sheet of plastic wrap about 18-22” long. Pipe a 1-2” wide strip of frosting up the plastic wrap. They should be about 12-15” long. Repeat until you have a strip for each color.