A popular option for dressing up and enhancing curb appeal is using exterior window trim. A popular option for installing new or repairing existing is to use a product called Fypon.
Fypon has a great product available for those that are needing to rebuild there existing trim details or would like to add new ones. Fypon is the leader in synthetic millwork and has a huge product line available to to give you a permanent solution to window headers, door surrounds, and various other trim needs. Available in nearly every shape and size at a cost that is very affordable when you take in to account the long life and lower frequency of painting required.