I then did some further research on all the proposed new states in India, found a good reference here, another one here, a third one here, downloaded an uncoloured district-level map from Wikipedia, a detailed district map from elsewhere, then painstakingly created two maps by colouring and labelling them with The GIMP, one showing the 30 Indian states that exist today and the other showing the 50 states that could exist if all the demanded new states were created.
For reference, here's what the country looks like today with 30 states. Click to expand.
On a more practical note, how can this ever become reality? The creation of new states always seems to be preceded by violent agitations and loss of life. It's a highly emotive issue for many, and not something to be pushed through by administrative fiat or because of political blackmail by some groups.
I think the idea can be eased into public consciousness (and eventual acceptance) through the creation of sports teams along the lines of those seen in the Indian Premier League (IPL) with its Delhi Daredevils and Rajasthan Royals. I can see a lot of scope for a new cricket or other sports code called (say) "India50" with teams like the Bundelkhand Bulls, Vidarbha Warriors and Konkan Conquerors. Once these identities get established in the public consciousness, statehood can follow more easily.