Interesting...
From The Lost Media Wiki
I think I found some B&L Movie concept art: http://2.bp.blogspot.com/_MdfMJdmEx30/Svdyy2cV_NI/AAAAAAAAAP8/9NRyB7UYjbw/s1600-h/10.jpg http://1.bp.blogspot.com/_MdfMJdmEx30/SvdyyaSaIRI/AAAAAAAAAP0/RYd0dcb76Ec/s1600-h/11.jpg http://4.bp.blogspot.com/_MdfMJdmEx30/Svdx1CiCNpI/AAAAAAAAAPU/P1r2BTiQ45A/s1600-h/15.jpg http://3.bp.blogspot.com/_MdfMJdmEx30/SvdyyG4xyoI/AAAAAAAAAPs/Q4pJ_lPNBXw/s1600-h/12.jpg
These were found on BigIdea artist Phillip Dimitriadis' blogspot page. Not to mention that the concept art seems to be under the label "BIG IDEA PRODUCTIONS - Feature Film Development"
Website can be found here: http://philsartportfolio.blogspot.com/