At Google I/O, in May, Google introduced Styled Maps which offers control over map features and color schemes. Stylishly ending the "one-size-fits-all" approach to base maps. This new cartographic concept was met with a lot of excitement for where developers would take it and since launch we've seen some very innovative work. Listed below are a few great examples of Styled Maps:
"Mapnificent's "London at Night" dynamically displays bus travel time. The base map is styled to create a nighttime feel and to emphasize major roads. Additionally, the darker base layer creates a better contrast for the isochrone visualization."
More InfoFive Great Styled Maps Examples