Sanskar Bharti Rangoli is very famous rangoli style in Maharashtra. It is a free-hand rangoli style where designs are drawn either with three fingers, five fingers (Paach Boti as said in Marathi) or with fist.
Now a days rangolis are drawn using a funnel, a special rangoli pen (readily available in Indian markets)
Traditionally Sanskar Bharti Rangoli are round in shape and the size of rangoli depends upon the number of circles.
Sanskar Bharti Rangolis can also be rectangular in shape which are called Galicha (read: Carpet) rangoli.