Though I am not much of a Mario fan, but I have played Mario Kart a few times on my friend's Wii, I decided to build a car from the game. I got some of the idea from Serucipe's Standard kart L.
About this creation
The side of the car. I made a kind of checkered-flag design in between the wheels. I also added some 1*1 slope elements to make it curved-ish.
A top view. Here there is a really good shot of the stripe. You can also see the engine pretty well.
The coolest part! I added dual suspension on the back tires, because when you are playing Mario kart, your not always on the road!
The suspension idea. Because the car was too small for the suspension lego parts, I used some rubber bands.
In case you were wondering, a minifig can sit in it, but he is a little small. Hope you liked my Mario Kart car, please rate and comment! PS: the minifig in the kart is my sigfig.