Flashing object

Now that we can create our own objects, I am wondering if it is possible to create a custom object similar to the police lightbar, or any other flashing object, where one side lights up in blue and another in red. Is it hardcoded in SA-MP, or is this achievable from blender (or perhaps any other software) too?

What I'm talking about:
http://gamerxserver.com/images/Polic...r-Animated.gif