Christina, there are some gorgeous bathrooms on that site, thanks for the link!
Margarita, my bathroom is even smaller than yours

The previous owners had covered the walls in seafoam green plastic tiles

So here's what I did - First I removed all of the tiles from the walls, and I put a new white tub enclosure around the tub walls. Then I put up beaded board paneling around the rest of the walls, about 4 1/2 foot high and trimmed it out. I painted it all bright glossy white. I then painted the upper part of the walls with a color. I had painted it a soft yellow, but I'm getting ready to paint it a light blue-green now. I hung a solid white shower curtain that was simple in design - white duck cloth with nickel grommits. I replaced the vanity and sink with a new white set. I hung white plantation blinds in the window. I know that sounds like a lot of white, lol, but it really opened up the room, and the color at the top of the walls keeps it from being boring.