Magickally, it can be used to promote harmony and to uplift, as well as to restore good fellowship and add a pleasant overtone to any undertaking. It can also help those who are grieving or depressed. The Sheils and Edred Thorsson both mention Loki in connection with this rune. Wunjo can be quiet and contemplative, but also pranksterish or even wild and extatic. This is one of the many good things about Polytheism.
Variety is, indeed, the spice of the spiritual life.
Wunjo lives in the here and now, so children and animals often understand and embody it better than do adults. While Fehu properly appreciated can help bring Wunjo into your life, very often the excessive greedy persuit of future Fehu blocks the Wunjo that is here to be experienced now. While prudent planning for the future is good, moderation is called for. Those who neglect their spouses, children, friends, and spiritual life in order to focus all their time and energy into getting rich generally wind up regreting it bitterly. However, living in the past is also to be avoided.