Have you ever tried to install a set of shelves only to find that the brackets get in the way? No matter how you change it around, you just cant seem to get it right. There is a type of shelving that can help you avoid this problem altogether, they are called floating shelves.
Perhaps the kitchen is your bete noir? If it is you can do a lot with some new blinds and lampshades. Try some potted plants on the window ledge this can brighten most kitchens. If the paint-work really is past its prime then you need to decide whether you need a whole new paint job or whether you can get away with touching up the doors and base boards. If your bedroom needs a face-lift then try some new bed covers and toning curtains. Add a few cushions to your bed and you immediately have a more luxurious look.