Cutest little garden shed/studio made from all recycled doors, windows, trim.-- I think my Garden Shed was supposed to look like this, but it looks more like a house now--I had too many doors and windows to put in it.
My Cottage Charm: How to Add Molding to Your Doors- Door Header Tutorial. DIY taller molding on original door casing. This could also work with existing window trim. Just get crown molding, plan wood board, and some extra trim for the top of the door.