If you subscribe to the belief that beauty is in the details, then upgrading your baseboards, door casings and other interior wood trim might be a good investment. However, removing and replacing interior trimwork can be a costly proposition. An alternate solution is to apply additional strips of decorative molding on top of what's already there. Small quarter-round, half-round, cove and ogee molding profiles are fairly inexpensive and can be attached quickly and easily. This video gives you some ideas.