I've really liked a few examples of Tyler Scout's 'cluttered'-looking 'mondo'-style illustrations in the past, and I've just come across these ones that he's done of the Original Trilogy. I reckon they'd make a neat set of covers, so take a look -
Click here for far bigger versions showing all the details - http://geektyrant.com/news/2010/12/29/awesome-final-star-wars-trilogy-posters-from-mondo-tees.html