There are specialized stores or individual people who can make your gadgets look greater, but, also, you can do it by yourself if you have a lot of patience.
GelaSkins recently announced a line of covers special made for Apple's products. They are special because are a little thinner than the covers made for any other kind of laptop models. The GelaSkins are a little too expensive, even if they don't cover your entire bottom surface of the MacBook, their price could go up to 33 dollars. But, despite the big price, everybody think them worth it, because it is a way to change your favorite gadget's look and to add it a new and fresh look, and also implementing your personal signature on its design.
Personally, I am pretty tired of all these silver or black laptops and when I see a lot of people with almost the same case model, I'm wondering how that they recognize their devices.
To "pimp" your MacBook , all by yourself, you need first to acquire a GelaSkins cover. With a simple study over it you will see that under the drawn face, on the other side, it has a sticky part that will come right on your case and will keep the model on it. You can buy these skins from specialized shops or searching the internet for online stores that sell this product for your type of MacBook. Some producers will let you design your own drawn and will make you a GelaSkins from every picture you will send them or they will provide you a design tool with a lot of templates that can be combined, for a plus of originality.
Once you entered in the possession of your favorite GelaSkins, you will need to make the second step. For this you will need to have a soft piece of material that is able to clean every impurity from your case. With large moves and patience remove every speck of dust and other dirties from your MacBook. This step needs to be made for a better adhesion. If you had in the past another bumper sticker and you removed, but have left some traces of its presence, try to remove them with a special diluent  solution that will not alter the material from what the MacBook is made.
When you are sure that your laptop is more than clear, and the front surface don't have any oscillation of level, remove the protective paper from your GelaSkins and try to stick it slow to the MacBook's front. Pay attention to not get any air bubble under it because this will make the GelaSkins to look weird and have some folds.
I will try to describe some of the most popular GelaSkins at this moment, so that if you want one but you are undecided, to try to help you in a future election.
The Hotrod pinup girl it is a drawn made by Gianluca Mattia and it is a tribute to the vintage photos of the classical photos with hot girls driving some nice cars, so popular in the 70's years. As you expected, the drawn represents a blonde  girl, wearing in a red dress, which drives an old car and keeps in her hand the 8 ball from billiard. Nothing spectacular but you have to know that it is one of he best sold GelaSkins from the market.
MacBook Shin Heart Cell is for those who prefer the light colors and are eternal lovers. The design is a simple one, made in red and white colors. It has some flying read hearts, on a white background and a precise cut out Apple logo in the middle of one heart. Again, this is one of the best sold GelaSkins.
For the Matrix fans, the  science fiction block buster of the  year 1999, GelaSkins created a cover with the classical symbol of this movie, the binary language in green, on a black background, with an Apple logo on the middle, of white color.
My favorite is from afar, the Miss coquelicots , a true piece of art. It has a Japanese girl in the middle, dressed in a traditional geisha costume of a green color, and decorated with a red corset. She has some red tulips in her hair and other flying tulips around. The background has a crude green color that fade to a dirty white.
There are a lot of models and choices of GelaSkins for MacBooks an if you want to personalize and add a little stylish and elegance to your favorite gadget, for sure this will be a good choice.