As a bonus action, you can summon a set of wings that allow you a flying speed of 30ft. The shape, coloration, and form of these wings are entirely up to you and your DM, as well as if they are ethereal or physical in nature. Different kinds of wings may hold other additional attributes. There are examples below. 

Ethereal these kinds of wings are semi transparent and may even give off a faint light or holy radiance. These may empower holy attacks or intimidate/put others at ease. 

Physical These kinds of wings are feathered and are physically attached to the persons body. As such, armor may need to be made to accommodate such a feature, but these may also be more powerful than other kinds of wings. 

At DM discretion, the wings can be considered permanent, persisting through sleep and other activities. However, the wings will always fade at death.