Something like this may work. Note the changed door positions so that anyone in the bedrooms can visit the bathroom without disturbing anyone else in the lounge !

More info such as a floor plan is needed.

I agree the plumbing looks sketchy i wouldn't invest a lot of money of decorative treatments if the pipes burst down the road. I would also look into your water quality it looks like you have a lot of rust stains that indicates high iron in your water which can really be hard on your plumbing and appliances. CLR is a product to improve the appearance but i would also look into Water softer as well. Stay away from natural products if your water is high iron they will stain fastest. Congratulations on the baby.

I did a house with nine bathrooms and it was so much fun. For the master bed we had his and hers separate ensuite bathrooms, so hers was feminine and victoruan; it even had a chandelier! His was white with a red shower wall and a blue and white border tile. The counter was tiled with red. It was a very cheerful little bathroom. The daughter's batH was blue and white, the border tiles and washbasin were Chinese themed. A very pretty bathroom. The two guest bathrooms were yellow and cream with hand painted sunflower accent tiles. One powder room was yellow and white, the other was beige with orange and green accents. It had a very whimsical washbasin with a hand painted frog inside. The pool house also has two bathrooms, more basic, mostly cream with wood accents. The colour comes from the stack of towels, red, blue, orange, lime green and yellow.