can anyone tell me if there is any specific kolam pattern that has to be drawn in front of the tulsi, and in front of the Puja room
There are no specific patterns that are only meant to be drawn in front of the Tulasi. Any rangoli or a dotted kolam could be drawn.
Here are some kolams to be made in puja rooms.
http://www.ikolam.com/node/346
http://www.ikolam.com/node/2162
Here is kolam you could make on the surface of your Tulsi planter:
http://www.ikolam.com/node/231
Hope these are of some help to you :)
hmm....i think in karnataka, in front of tuLasi..., shanka, chakra, nama would be written in the top border and would be acompanied by lotus, surya, chandra and nakshatra. then any other rangoli would be fine, according to avaliablity of space. please check lakshmiraghuji's gallery, which has kolams written in front of tuLasi brindavan.