apartment therapy's ohdeedoh tipped me on a fabulous flickr find. it ain't a hack but i couldn't say no it.
sarah turned a bonde bookcase into a dollhouse, with working lights! it brought out all that girl-envy in me. as carrie noted, the best thing is when your child outgrows the dollhouse, you've got a bookcase ready for service.
thanks carrie! link.
see sarah's doll set on flickr.