India Post has issued greeting cards for many many years for its own use. Occasionally it has also sold cards produced by it to the public.
Between 2000 and 2004 it has also issued Greetings Cards with stamped envelopes where the imprinted stamp on the envelope is an exact replica of the greeting card design.
These are listed along with postal stationery at http://www.stampsofindia.com/lists/pss/gp/2004gc.htm
Here we list Greetings Cards released for sale by India Post
Nov 9, 2012: Uttarakhand Circlre ofIndia Post, Set of 5 Cards, Rs 10 each with envelope and message printing
2012 Jun: Greeting Cards, Jammu & Kashmir Circle of India Post, Set of 3 cards, Rs 15 each Card with Cover
2008 Dec: Greeting Cards, Uttarakhand Circle of India Post, Rs 10 each set of Card & Cover
2008 Jan 11: Greeting Cards & Covers, Karnataka Circle of India Post, Rs 10 each set of Card & Cover
2007 Feb 7: Roses, Rs 60 includes a set of 4 stamps and a blank First Day Cover