Converting an existing cultured marble tub/shower combination to just a shower with a tall linen cabinet is a very popular bathroom modification right now. Here is an example:
We removed the bathtub and replaced it with a modern walk-in shower with glass door, as well as adding a new linen cabinet for additional storage options. The new walk-in shower was built with coordinating stone tiles and updated shower fixtures. We updated the rest of the bathroom with a stone countertop and added stone flooring to tie into their existing flooring. We also updated the lighting fixtures and gave the bathroom a coat of fresh paint.
Before 
AfterMore after pictures:
