Custom shelves and towel racks are a very simple and inexpensive way to make your bathroom look more complete. A simple way to make shelves would be to use scrap pieces of wood, even live-edge slabs to add a rustic feel. The only other thing you would need are brackets, which are inexpensive and available at any home improvement or home décor store. You can even reuse old brackets and freshen them up by spray paint them to make them look more modern!
DIY towel racks also add to your bathroom, and are very easy to create! This tutorial shows you how to make a rack out of a wooden rod and curtain rod brackets. This could also be as simple as screwing hooks into a piece of wood before mounting it onto the wall to add a more professional look.