You can set your own icons for Google Maps in DJ-Classifieds.

Different icon can be set for each category you have.

It's easy to do so. Just follow the instructions: 

1. create the icon you want to assign to particular category
2. name it as in this scheme: djcf_gmicon_XX.png where XX is your category ID (i.e. djcf_gmicon_10.png image will show different icon for category with ID 10)
3. upload the file to Joomla /images folder (your joomla main folder /images)
4. set "Maps icon" option to "Custom" in parameters
5. you're done the custom icons will appear on your maps module and on advert's detail page

note: you can replace icon for certain categories only if you want, then 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 just name the icon: djcf_gmicon.png and upload it to the same /images folder