MapServer allows you to define styles for features. These can be stacked on top of each other. Common simple style settings are:
POINT (SYMBOL)
STYLE SYMBOL "circle" SIZE 8 COLOR 0 128 0 END
POLYGON
STYLE # solid fill COLOR 115 192 0 END STYLE # thick outline (could use a circle symbol with size too) OUTLINECOLOR 0 0 0 WIDTH 2 ANTIALIAS TRUE END
POLYLINE
NAME "Streets" STYLE COLOR 192 192 192 SYMBOL 'continue' SIZE 4 ANTIALIAS TRUE END STYLE COLOR 255 255 255 SYMBOL 'continue' SIZE 2 ANTIALIAS TRUE END
ANNOTATION
CLASS LABEL FONT "arialbd" TYPE TRUETYPE COLOR 0 0 0 OUTLINECOLOR 255 255 255 SIZE 10 POSITION cc ANTIALIAS TRUE END END