The idea of storage over the toilet is basically a budget-friendly creation of storage space in an area that had not been previously utilized in most houses. This space will ensure a more organized, useful room and prevent the room from looking bulky.
Take a ladder shelf and left out the bottom 2 rows to fit perfectly over the toilet. This could make for extra storage space without looking too bulky. http://hative.com/over-the-toilet-storage-ideas-for-extra-space/