Do you have a couple of rooms upstairs away from everyone that is being used for storage? Want to do something different and have a place to relax. I have some ideas that might help you with your new project.
Put a large sliding glass door between the two rooms. In one corner, two steps up set your extra large tub. How about add a skylight in the ceiling to let in the daylight during the day and the stars at night. Dont forget to add mirrors around you tub with lots of candles on the ledge. Candles are so pretty reflecting off the mirrors. Maybe you might want more light so put one or two fancy light fixtures on one wall or in the ceiling.
If you have a large bathroom, why not install a fireplace on the opposite side of your glass. A fireplace will add more of a romantic and relaxing sensation to your rooms. On the ledge add some more candles and maybe put a picture over them to go with your theme.
Always chose a theme before you start your new project. Having a theme will help you to choose your colors and the mood you want to have when enjoyed your time.
You can also install a large cabinet at the end of your sink. Set a microwave and mini-fridge...