Twelve colours are on the Tiago list, and they come from six shades. As a single tone you can have Pristine White, Daytona Grey, Pure Grey, Pangong Pulse, Sobo Surge or Varanasi Vibrance. Those six also come with a black roof, which makes 12 Tiago colour options in all.
Your trim decides how many you can pick. Petrol or CNG, the base model Smart offers four: Pristine White, Daytona Grey, Pure Grey and Pangong Pulse. Every Pure adds Sobo Surge, and the Pure+ and Creative trims get all six single tones. The top model Creative+ is sold only with the black roof, in all six shades.
None of the colours costs extra. The black roof is simply part of the Creative+, which starts at ₹7.36 Lakh ex-showroom, ₹30,000 above the Creative.