Hi! I would first begin with wall art. Here are a few ideas for you:

http://deciture.com/attractive-multicolored-wood-metal-wall-decor/ (fun and cheerful)

http://deciture.com/bennett-found-object-wall-plaques-set-of-4/ (rustic)

http://deciture.com/camara-batik-and-newspaper-bird-wall-decor/

Hope this helps you!

I'd paint the walls and get a gray and white shower curtain. The room is so white

Paint the walls the same turquoise as seen in the picture on the wall. To make it fun and colourful add accessories in the same colours pulled from that same picture.

I love bright white in the bathroom but this is a bit much. I would paint the walls. I know of a wonderful pale blue green grey- modern, fresh and gender neutral. Don't recall the name but I can look it up if interested. needs interesting shower curtain (check out urban outfitters. Fun options for kids bathroom).

@RachelGubser: Do you know the name of the colour?

It might be fun to do decorate with red accents. A long red and white stripped runner in front of sink, large poster (maybe a circus theme) with a red frame over the toilet and a series of prints along the long wall in black frames. Bold patterned towels. Some red baskets for the counter for their items.

The bath is very nice. Possibly install floating shelves over the toilet and install a more interesting shower curtain. How about purchasing metal letters spelling out each child's name

Something like these?

I like it as is. But if it's too white for you, painting the walls yellow would look amazing with the white and grey vanity. You could leave the bulkheads (areas above bath) white for architectural interest and height. Just those small pops of yellow walls could make a big impact. Don't add any other colours though - keep white or grey towels. I'm posting photos of a condo that I did in this palette only to show how colours look together. Hope this helps. Good luck from Montreal.

Patricia Colwell and Maureen have great ideas!! Love the black, white red idea. And I love the pictures/wall hangings someone posted. You have some great ideas here. I just creep on these posts looking for ideas for me. Lol. I am not creative/confident enough to be offering advice.

Warner Decor had the great pictures.

I would leave the walls white and just add lots of bright colours in towels, shower curtain, wall art, etc. Easily changed then as the kids get older and their taste (and yours) changes.

Hello, the color I was referring to is 'Quiet Moments' by Benjanmin Moore. It's lovely. I suggest something like these from Urban Outfitters: Bianca Green For DENY LA Told Us So Shower Curtain or Shannon Clark For DENY Dizzying Heights Shower Curtain. Add a piece of art with a wood frame and a basket or 2 to bring in some natural elements. Good luck and let me know how it goes if you do any of these.

This bathroom is very nice however it can use a pop of color. Start by changing the shower curtain and rugs.

Paint the walls a taupe or soft grey. Maybe go from knobs to pulls on cabinetry doors to add architectural detail. All in all it looks good already.

@RachelGubser - thanks for the wonderful tips. The color you suggested is beautiful!

Sherwin Williams Downing Slate
Or a lime if you are a green.
People are either a green or a blue

;-) Or they're aquamarine, like me ... a little green and a little blue

Everyone has made fantastic suggestions -- the cheapest remake is colored accessories -- towels, shower curtains, area rugs, soap dishes, etc.. Next is a gallon of semi-gloss paint. The great thing about the neutral white background is that you can change things out easily (and relatively inexpensively) as the kids grow up. I liked the suggestion of wall art -- one of the things you might like are Blik surface graphics -- they define their products as "Wall graphics for the commitment-phobic" and they're not kidding, they are easy to install and easy to remove. You can check them out at www.whatisblik.com -- they have all sorts of fun things for kids.

Here is an example of a blik graphic at my house :-)