Anything that you can do to your bathroom is a great way to add value to your home. However, before you jump into a project, have a good look at the actual problems and issues, instead of simply doing things so that you can say this is a new toilet.
Bathrooms are tricky places, and as much as you want to maximize their appeal, as they are a main selling point in the house, you also do not want to get stuck with a project that will not pay off when you sell your home.
Also, if you do dive into a task, you risk running into unexpected problems when it is too late to go back, and then you may be stuck with some unfortunate unexpected expenses. Such costly surprises should be avoided if at all possible.