Tantalizing color glimpses of a galaxy of imaginative conversions. In flight from ""the bland living environment endemic in our world,"" artistic types on the West and East coasts, in England and France, have taken up residence in factories, ferryboats, schoolhouses, and other, still stranger structures. Most spectacular is the snuggery with a sweeping view in a former water tower atop San Francisco's Russian Hill; most admirable, perhaps--the compact, clean-swept interior of a converted Connecticut icehouse. In many cases the interior decor dominates, House Beautiful fashion, and the lack of floorplans is a serious handicap to understanding what the owners did with their foundlings. So this is for vicarious veiwing, like those annual Open-House tours.