You can set your own icons for Google Maps in DJ-Classifieds.
The different icon can be set for each category you have.
It's easy to do so. Just follow the instructions:
note: you can replace the icon for specific categories only if you want, then the only icon for this category will be changed other adverts will have default icon.
note2: you can also replace the default icon with yours, to do so follow the steps mentioned above name the icon: djcf_gmicon.png and upload it to the same /images folder