first, the smallest set, ie, the prize, for this contest will be Olivia’s speedboat. http://shop.lego.com/en-US/Olivia-s-Speedboat-3937
and, to clarify the rules a little bit. Studs facing vertical, and showing, is OK. Connections on to those vertically facing studs is not. if you built a tower of 2×4 bricks vertically, it would not be OK. If you knocked it over on it’s side, now it’s entirely legal, though boring.
got it?