The actor plays a country servant who falls in love with Anushka Sharma's rich Oxford-educated girl.
He told Bollywood Hungama: "He is very artistic so he would come up with these really innovative designs on the spot.
"And inspired by Anushka's sexy tattoo that she is sporting in the film, he is bound to come up with equally hip designs.
"Anushka will be seen sporting a very interesting tattoo on her lower back in Matru Ki Bijlee Ka Mandola. And Imran too is known to be high on tattoos and sports one himself. So then they came up with the idea of Imran turning tattoo artist."
Khan also reportedly gifted co-star Sharma with a painting of the city Bengaluru.
In October, he claimed that he had almost dropped out because the preparation for the role was so tough.
Watch the trailer for Matru Ki Bijlee Ka Mandola below: