Stavic of course...it has the potential to scare the hell out of kids and the elderly if they're alone with it in some deserted car park at night....but in terms of 'cult' followed ugly Desi cars...the winner must be, hands-down:
FX and FX alone!!!
and yeah some of those late '70s Mazdas usually used as 'kaali peeli' taxis are quite hideous as well.