You can get a good looking lavatory even if you are on a tight budget. You will inevitably need to cut a few corners but they won't need to be drastic or anything too dramatic. One of the best n-ways to boost your john if you're on a tight budget will be to go at it slowly. Take it a piece at a time or even a particular set at a time and change your old bathroom decor to suit your new bathroom decor.
The problem with that though, is that you might not get to see a striking change taking place, alternatively you'll have a gradual change which can be rather unsatisfactory sometimes. So another thing you can do would be to change more or less the whole of your bathroom decor all at once. This can be more comforting to the individual and can brighten your day considerably when you see the changes that have been wrought.
The best place to start though, whether you're on a awful budget or not, is by fetching the time to sit back and think about what you want changed about your bathroom decor. Unless you're amply redesigning your bathroom then it's almost a presumption that you won't change round any of the fittings. So since any of the major kit and boodle are out you next need to decide what it is about your old bathroom decor that you disfavor so much and what it is that you want to change.