Here are the cartograms. See this post for details about how these maps were generated and where the data used for these maps came from. All these cartograms can be used under the creative commons license. You can use it however you want to, just acknowledge the source. The raw data is available here (scroll to the bottom to see it)
Note: The south has become very large, West Bengal and Assam are almost absent due to the low number of OBCs. (WB has only 6% and Assam has 18%, TN has 65%, Kerala 52%)
Note: West Bengal (63%), Maharashtra (50%) Assam (56%) have large number of forward (or open competition) castes. Tamilnadu has shrunk a lot due to the low number of forward castes (10.66%)
Note: See how the northeast is larger due to the large number of scheduled tribes. Lakshadweep is larger too because 94% of population is ST.