In a small space be mindful of how much you want to put in it. Keep your storage minimal and compact eg buy basins with storage drawers to keep shampoos hidden.
If you have shelving, buy nice designs that compliment your space, that way you will be more inclined to only show off beautiful accessories such as candles or bath oils.
Glass shelving is perfect for this, it quietly does its job without any fuss. It lets light through and gives a very contemporary finish to any design.