Just like front, rear guards are also available in market. Have seen them installed in some cars, but aren't best for visual appeal though. You can find them in any popular car market in Delhi like Karol Bagh or Palika, Opp. Hayatt.
i wouldn't suggest you to install bull bar in such tiny i10 car . it make car look like some cheap cab car . still if you want then go for those bull guard which can be install on bumper not on chassis