This Lagoona Blue costume from Monster High is not only impressive to look at but fun to wear as well! If you’re someone who appreciates the lagoon look to this costume, then this could be the perfect thing for you to wear this Halloween. If you’re planing to put this costume together yourself, you’re going to need to pay lots of attention to all the details. For the Lagoona Blue wig, notice how she has some blue highlights in her hair and that it’s not just all one color. Make sure to include the small red flower on the left side of her hair.