Line Rangoli is traditionally followed by Tamil Nadu. Tamilians prefers to draw this kind of Rangoli on Friday, at the entrance of the house or in the pooja room in front of the GOD. They believe it will drive away the evil spirits and also it will invite Godess Lakshmi. Basically these are geometrical patterns and designs. You can elaborate the designs as per your choice
Design 01 - Step 01
You can do like this also. Another version of ending this rangoli.
Design 02 - Step 01