When I found house plans I liked I redrafted them to change a three bedroom house into a two bedroom house with a big walk through closet and a huge ensuite, and added the extra bedroom on the entry level floor.
My ensuite has a shower large enough for two, with a big rain shower nozzle and a separate hand nozzle shower sprayer. I added a niche big enough to hold the large bottles of shampoo and conditioner. I incorporated a very large vanity and a beautiful built-in linen closet with glass upper doors. I also have a free standing tub, which are perfect for a spa like bathroom. I got the biggest one (six feet long) I could in my price range in the simple rectangular shape I wanted. I added a spray nozzle in order to make cleaning this huge tub super easy, and its also nice for rinsing hair. In fact I added a detachable spray nozzle to all the showers in my home as well for the same reason.