Well, I think everything on earth can be used for good or bad. But what I love is Color Healing. Think of all those folks who say they are cured by belief, but have been sitting for hours in the lovely colored glow of God's sun shining through stained glass windows. Gifts from God can take many forms.
I'm thinking of having someone using scraps to make me a crazy quilt of glass to go in my front room south facing windows. They are a pair that has a non-lovely scene of the side of the neighbors' garage wall!! Or maybe taking up that hobby myself, should it be far too expensive.