ColorBook

map data:

/* naive color scheme*/

/* can be used as template */

.fill.tag-natural-water, .fill.tag-landuse-reservoir { fill: lightblue; }
.stroke.tag-natural-water, .stroke.tag-landuse-reservoir { stroke: blue; }
.fill.tag-waterway { fill: lightblue; }
.fill.tag-building { fill: red; }

.tag-waterway { stroke: blue; stroke-width: 2px; }
.area.tag-waterway { stroke-width: 1px; }

.casing.tag-highway-motorway { stroke: black; stroke-width: 4px; }
.stroke.tag-highway-motorway { stroke: orange; stroke-width: 2px; }

.casing.tag-highway-motorway_link,
.casing.tag-highway-trunk,
.casing.tag-highway-trunk_link,
.casing.tag-highway-primary,
.casing.tag-highway-primary_link,
.casing.tag-highway-secondary,
.casing.tag-highway-secondary_link,
.casing.tag-highway-tertiary { stroke: black; stroke-width: 4px; }

.stroke.tag-highway-motorway_link,
.stroke.tag-highway-trunk,
.stroke.tag-highway-trunk_link,
.stroke.tag-highway-primary,
.stroke.tag-highway-primary_link,
.stroke.tag-highway-secondary,
.stroke.tag-highway-secondary_link,
.stroke.tag-highway-tertiary { stroke: yellow; stroke-width: 2px;  }

.casing.tag-highway-residential, 
.casing.tag-highway-service { stroke: black; stroke-width: 4px; }
.stroke.tag-highway-residential,
.stroke.tag-highway-service { stroke: white; stroke-width: 2px;  }

.casing.tag-railway-rail { stroke: black; stroke-width: 3px; }
.stroke.tag-railway-rail { stroke: white; stroke-width: 2px; stroke-dasharray: 12,12; }

.stroke.tag-railway-tram { stroke: red; stroke-width: 1; }

.tag-landuse-forest { fill: green; }
.tag-landuse-grass { fill: lightgreen; }
.tag-tunnel { display: none; }

Created by Severak. Inspired by ColorBrewer and rendering architecture of iD editor.