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/
Pinned for the idea. Not sure how much I like the extension over the toilet. If were to do, vanity top should be one piece, with no cut line. Also: Consider how much the extra counter space would be needed.
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.