Oregano flowers are in fact edible and can be used in a number of different dishes, including those that include various vegetables. Sometimes people even use leaves from oregano on their pizzas as a topping.
Oregano flowers that have been infused with certain oils can be both delicious and decorative, so that is something to consider if you want to get as many different uses out of them as possible. These flowers can also be used in the garden. Some people put the pink or white flowers which grow on the end of oregano stems in their gardens in order to produce a delicious edible flower which has sort of a honey-like taste to it.