I had a similar dilemma at my old house! First I painted the blah white walls a bold purplish blue, similar to some of your examples shown above. It was heinous and accentuated the yellow tiles rather than make them recede (which I think is what you want too). Then I painted the walls a light grayish green, similar to Sea Salt but lighter, and it was such a vast improvement. I think your bathroom tiles are a brighter yellow (mine were harvest gold), but hopefully this example helps. I used a white shower curtain and towels with some turquoise accessories and it made the less-than-ideal bathroom way more tolerable. Good luck!

I agree with Cpartist"s layout and like moving the closet over as suggested by D M so that bedroom 3 has easier access to the bathroom. Do you have room to have the toilet face the tub and add a linen cabinet next to the toilet? How wide is the tub toilet area?

A guest bath doesn’t get the wear and tear that a master does and IKEA doesn’t break the bank. Go with it and replace when needed (I think it will hold up for quite a while). I think you can get away with just the ceiling light, just put it on a dimmer. Wallpaper the outlet…it isn’t hard at all to do. Just match the pattern with the wallpaper itself.

Out of the 3, Lattice is our favorite. If you are looking to warm the space up we also suggest taking a look at SW Jogging Path and SW Contented. Jogging Path is a warm gray/green shade. Contented is definitely green, but it reads more as a neutral warm green than a 'true green' color. You may not like them with the lighting in your space, so we suggest picking up a chip to see. We can only tell you what looks good in our lighting at the studio, and it is definitely not going to read the same here as it does in your home! We hope you find a perfect paint color!