A good rule to remember is to use a darker bathroom floor than the walls and ceiling. You can choose unconventional and go your way if that tickles your fancy.
If you're employing a professional, installing a bathtub shouldn't take more than two or three days, no matter how big the tub is.
Most people are surprised to learn that it takes about six weeks to finish a standard bathroom renovation. Among the things that may need to go are the shower enclosure, the light fixtures, and the bathtub if you already have one in your bathroom.
It's best to start by designing the finished space. You may get inspiration from your friends and family, magazines, blogs etc. You can also get advice from professional bathroom fitters. Remember that Easefix can help you with bathroom design and installation.