Paint - You can change the color of the cabinets so that it creates the illusion of new cabinets. A lighter color will make the entire kitchen look brighter and more spacious.
Refinish or re-laminate - If you like the natural look, you can sand and varnish the cabinets to make the kitchen look warm and inviting. If the cabinets are laminated, they can be covered with wood or vinyl veneers.
Create open shelving - Remove the cabinet doors and create open shelving. It will create space and allow your dishes to become part of your decorating scheme.
New hardware - This is one of the easiest things that you can do yourself. New drawer pulls or handles on doors can provide an instant upgrade. There is a wide variety of styles and materials available.