JoomMap support Snazyy Maps styles, you can choose predefined map styles when adding/editing a map.
Note: to enable this feature, make sure Maps Style plugin is enabled in plugins manager.
Go to JoomMap, click on "Maps" in sidebar menu , edit or add a new map , click on style tab and select a predefined SnazzyMaps style.
Then click on use this style code and click on save , you will see a new map style, you can also add your own style code.
Example of map style