Is it possible to repaint over a vanity and a toilet?

Yes you can paint over a vanity as long as you prep it correctly. I do not believe you can paint a porcelain toilet.

:)

There are so many different types of paints on the market now, it's very possible that you can find a paint to suit your needs. Why not go to Home Depot or a similar store and talk to the person in the paint department.

For a bathroom its suggested to use either a satin or semi-gloss finish as its more durable. For a toliet, I would look at Rustoleum Tub and Tile and see what they say about toliets.

I just finished painting my vanity and you most definitely can do this: http://www.hometalk.com/diy/bathroom/completed-my-1990-s-bathroom-reveal-29927365

As far as painting the toilet, I would just replace it if you have the money. The refinishing kits that I have seen (because I also just painted my tub and surround) I believe are for tub and tile projects. You may be able to apply the same product to the toilet, but I am not sure. Check with Home Depot or Lowes before doing it. Good Luck!