http://www.strasis.com/documentation/limelight-xe/reference/tile-map-servers
you can add most of the maps here. but i personally like for [ArcGIS Online Maps] and [Carto Base Maps]
you just need to copy one of the URL and paste it to urlTemplate of lib\maps\map_and_navigation.dart
if you use Carto base maps. remember to remove the '{s}' of the URL
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Sign in to https://studio.mapbox.com/ and open mapbox studio
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click on the create a map in studuio button
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click on the new style button
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choose a template **and click on the cutomize button
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cutomize and change colors as you wish and publish the map
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click on the share button
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select third party and carto
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finally copy the integration url and past to the urlTemplate of lib\maps\map_and_navigation.dart