13 - 7 interlaced dots (Idukku Pulli) Kolam.
Start with 13 dots in the center and stop at 7 by putting interlaced dots at both sides. Then again put six interlaced dots at all the corners and stop at one as shown above.
Join dots as shown above and fill with desired colour powders. For extra decoration, I put a circle around the kolam. You can leave the kolam without circle or with any other designs of your choice.