• Window trim doesn't have to be plain; there are many carved trim styles to add depth and interest.A shadow of a window cast on a wall in black and white image by David Smith from Fotolia.com
  
  When windows are installed, there is a small gap all the way around the window. This gap is to allow the installer to make slight adjustments to the window and then seal the window properly with caulk and insulation. The interior window trim is added to cover up this gap, but also to add a decorative touch to the window. Depending on the taste of the home owner, varying styles of window trim are available.
  
  

Rosettes

• Rosettes are wooden blocks that have a decorative circle in the middle of them. These are installed in the corners of the window, with the trim boards going in between the rosettes. This decorative accent is most commonly used with fluted trim. Fluted trim has three concave lines cut into it lengthwise.
  
  

Architrave

• An architrave is a combination of four different moldings that make up one large molding over a window. This is a classic type of molding that is seen in many high-end homes that are older. For new installations, the achitrave comes assembled in one piece that is put together or molded in a factory. This saves significant amounts of time. The sides of the window with this type of trim normally have a colonial or classic type of trim that has a very simple rounded edge detail and a light taper toward the inside edge of the trim. The sill trim is usually a sill molding with the bottom trim piece coped into it. Coping is a technique that traces around decorative moldings to make multiple pieces of trim or transitions in corners appear seamless.
  
  

Key Moldings

• A key molding is a centered piece of molding with slightly angled sides at the top of the window or door, between the top moldings. This type of molding is more common in older homes, but can be incorporated in newer homes as well. The moldings have to be a little wider to use key moldings (4 to 6 inches wide versus the standard 2 1/4 inches).
  
  

Stool and Apron Moldings

• The stool is the trim piece that is normally seen on older homes that is at the bottom of the window. It is called a stool molding because it projects slightly outward creating a small ledge. The apron is underneath, supporting the stool molding while adding depth to the window trim. This was often used in homes in the early 1900s and before.
  
  The new stool moldings line up evenly with the window jamb to form a seamless look. The apron is nailed underneath once the stool is shimmed and aligned properly.