Documents required for Colombia Visa for Indian Citizens:

Original Passport with at least 6 months validity and minimum 3 blank pages + all old passports if any
2 Scanned recent colour photograph. 
Visa Application forms: completed and signed
Personal Covering letter: explaining purpose of travel to the country
Original Bank Statement: stamped & updated for last 3 months with bank seal
Air tickets: proof of return flight tickets from and back to your home country
Hotel reservation: proof of accommodation for your entire stay
Travel Itinerary: day-wise plan outlining all elements of the trip