I think stamen maps "toner" render is a good start :) http://maps.stamen.com/#toner/12/37.7706/-122.3782 http://maps.stamen.com/#toner/12/37.7706/-122.3782 (m

I think stamen maps "toner" render is a good start :) http://maps.stamen.com/#toner/12/37.7706/-122.3782 http://maps.stamen.com/#toner/12/37.7706/-122.3782 (make sure to chech out the shading on watercolor too though!)