You have heard of bathroom humor. You at least should have heard of bathroom literature. Now, it is time for you to hear of bathroom aesthetics.
A good place to start is with an open air shower, tiled in deep sea-green celadon, with a fire-tree for a roof. Not too leafy or else you won't see the sky while you shower. Then you must arrange for a nice stiff breeze from time to time to strike your tree, shake its branches, and strew a few flowers on your floor. Not too many, and, please, not too symmetrically.
It's best if the fire-tree if of the blood-orange variety, but, in a pinch the yellow blossom will do. Of course, yellow blossoms go better with deep blue tile; and as retiling is really only a little more hassle than replanting a tree (after all, once planted, a tree mostly grows by itself); it's best to get your blossoms-and-tile color scheme right -- right off the bat.