apartment therapy changing the world, one room at a time

Wow! That is a bizarre vanity. It looks as if the only obstruction underneath the vanity would be the p-trap and the leg on the right.

I would take measurements of the space below and start looking at Ikea inventory for some kind of cabinet you could fit in this space.

If you wanted to get a little adventurous, you could remove the drain underneath the sink and run it through the cabinet.

Here is a link to a pretty cool example of what I'm talking about:

Bathroom Vanity: 101
http://moderninmn.blogspot.com/2007_02_01_archive.html

Something like this
http://www.potterybarn.com/gift/thm/THMBAS/index.cfm
to hide most of the space, and baskets on the shelves for storage

While I love Kartell's option described above, the Container Store also has some nice drawer options (Juxta) and plastic boxes that stack.

A tailored curtain could look good (made from a stiffish material with no ruffles -- like upholstery fabric). Or you could hang panels from inside the top of the vanity. Plastic or MDF would work, and you could paint them any color. But a curtain would allow for the easiest access.