Can I show different colored points from kml files in Google-Maps overlays?

Can I show different colored points from kml files in Google-Maps overlays?

I extract the coordinate information from multiple kml files created by
google's MyTracks app and merge them to create a consolidated file. Those
files have the following form:
<?xml version="1.0" encoding="UTF-8"?>
<kml>
<Document>
<Placemark><Point><coordinates> -125.362289,50.057000,0.0
</coordinates></Point></Placemark>
<Placemark><Point><coordinates> -125.363414,50.058000,0.0
</coordinates></Point></Placemark>
<Placemark><Point><coordinates> -125.372059,50.056000,0.0
</coordinates></Point></Placemark>
<Placemark><Point><coordinates> -125.366759,50.058001,0.0
</coordinates></Point></Placemark>
<Placemark><Point><coordinates> -125.376856,50.066001,0.0
</coordinates></Point></Placemark>
<Placemark><Point><coordinates> -125.377394,50.067001,0.0
</coordinates></Point></Placemark>
</Document>
</kml>
This code generates blue balloons in Google Map Maker
(http://www.google.com/mapmaker). I would like to know if this code can be
modified to create different coloured balloons. This will allow me to
determine which points come from which source files.
Secondary questions: (1) Can the balloons be shown as coloured points? The
balloons take a lot of visual space when I am working, so I would like to
use smaller points if possible. (2) Can the above code be made more
compact? The three tags "Placemark,Point,coordinates" seem like overkill
for such a simple presentation.
If anyone is interested they can see more of my consolidated kml files
here:
https://sites.google.com/site/keithkmlfiles/home/kmlfiles/point_files/snowden
Thanks for any help.