Thought I would share pictures of the two vanities that I built for my house. Currently in the process of building the kitchen cabinets. Pretty much just have to build the doors and draws and put up the crown molding.
The 1/2 bath vanity is the one that is the corner unit. It is made with straight grained fir. I happened to find at a local building surplus materials store near me 5/4 x 11" fir stair treads that were completely knot free and $6 a lf. So I bought a bunch and used it for several projects including the vanity. The counter top is made of Mangaris which I also found there. It is similar to Mahogany and looks great with a cherry or Mahogany stain.
The full bath vanity is maple with Mangaris panels and counter top.