Start by looking at photos on Houzz, and creating ideabooks of what you like, This will help you focus on ideas. Once you are closer, start to plot down spacing and then we can start to better assist you

Sorry but I don't understand your pictures. You are talking about 2 bathrooms but we see only one floor plan. Is the 1.52M x 2.24M the 5 x 8 bathroom in your dilemma title. If so, can we see the floor plan of the 5 x 9 bathroom? Is the space with a small rectangle in the middle the extra 5.5 x 4.9 ft space you mentioned in your dilemma? Also 1.52M x 2.24M is in reality 5'0" x 7'4". This is 8 in. less. It can make a big difference on how to place fixtures in a bathroom.

I currently have the same problem! I wanted that but the tiler didn't do it. I saw it after the shower was finished tiling (when I got home from work). They told me it was too difficult to cut the porcelain tile in a triangle shape and install. I did some research and I can't find a product that can hold weight, even if it is just to shave my leg! I suppose I should have had a triangle corner with a base (that wasn't floating) but I think it is too late. Hopefully someone can tell both of us a better answer. Just realize this was posted July 2014....... where you able to solve the problem??????

Create an ideabook, look through some photos and save the ones that you like as a start to get a better idea for your style.