The basic problem is that most cruisers are made to fit smaller people. So they look good with the seat all the way down, but if you're taller and actually ride very much, you'll have the seat way up, and may need some funky handlebars as well, and the combination just doesn't look good. The ideal solution would be bigger frame bike with about 30" tires to maintain the sense of scale, but I don't think I've really seen anything like this. (Although Coker did have their "Monster Cruiser" with 36" tires, and Hunter Cycles does make a custom cruiser-style frame for 29'ers). Caloi made a large-frame cruiser, but I've never seen a used one turn up- it would be cool rat-rodded.