I made a set of these years ago from foam. It is based on the small demon horns worn by Jason Lee when he played Azreael in the film "Dogma". Its a quick ZBrush sculpt, I'm thinking of wearing them to a halloween party sometime. Just print 2 of them, paint them up and use a safe adhesive to attach them to your head (not superglue).
There is a slight indentation in the base to make it easier to fit to your forehead, but you may want to make it deeper. They can also be scaled to any size you want.

Enjoy.