You can create your own icon by defining it in your own class like s:
.icon-car {
background-image: url("http://cdn5.iconfinder.com/data/icons/Symbolicons_Transportation/24/Car.png");
background-position: center center;
}
Keeping in mind of course to use the prefix .icon-*
since it is targetted by an attribute selector set by the bootstrap to apply all styles (widh/height/line-height etc...).
Just try to keep to the same width and height as the original icons (14x14), this way you won't have to define your own width and height and it won't mess with the line-height
of your elements. Here is a demo with such a case: http://jsfiddle.net/RwFeu/
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