Well... the walls would still need to be pained a base color, and you need curtains, and 4 or 5 hours to put together a crib with an allen wrench and instructions only in swedish and chinese, and fold all the itty clothes into the dresser, and such...
Psyche, really... do you want ordinary for your child, or one of a kind? if you insist on wall paper, at least do hand painted.