Here's how to dress up an old kitchen with new cabinet doors. Use a fine-grade plywood, such as birch, for the new doors. Cut them to size on a table saw. Choose a three-eighths-inch panel molding and miter the four corners. Glue and with one-inch brads, nail the trim in place. Leave a one-and-a-half-inch reveal around the edge of the door. Just paint and mount to your old cabinet boxes. It's an easy way to get a raised-panel look.
For more on kitchen cabinets, consider:
Kitchen Cabinets 101
Cabinet Doors Styles: What's Yours?
5 Creative Alternatives to Kitchen Cabinetry