Change the hardware in your bathroom. Modern-looking door hinges and drawer pulls are relatively inexpensive, and a screwdriver is the only tool necessary to make this change.
Remove any retro towel racks and replace them with ones that are in a contemporary silver toned or neutral color.
Change the faucets and shower nozzle to a more contemporary style or hire someone to do it. This is particularly effective if the faucets have porcelain knobs or other retro features.
Paint the walls in a white or silver gray shade. A new coat of paint revives any room, and bathrooms generally require very little paint. These shades will brighten the look and detract from the pink and blue fixtures.
Pick a new shower curtain with a contemporary pattern. Choose one that accentuates the pink and blue or choose a neutral white or beige solid color. Since this type of decor takes up a large amount of space, it detracts from the overwhelming pink and blue colors. New matching window curtains will also help transform the look.
Hang up new towels with a contemporary border or pattern that complements the new shower curtain.
Pick new soap dishes, toothbrush holders, makeup organizers and other knickknacks in a modern style. Display these on your countertops to give the room a contemporary ambiance.
Replace light fixtures if your budget allows. Choose sleek contemporary styles to match your other improvments.