The Hompy DreamWiz is a cool fun program, it's in Korean, and I figured out how to use it to make rooms, even though I couldn't figure out how to read the site.
It's an awesome little maker, I wish I could read Korean.
Anyway, here's the how-to for English-speaking.
PS - I can't figure out any way to get rid of the little girl doll, so you are kinda stuck with having her in the room. Sorry. But, you can rotate her around to face different directions and stuff.
Oh... uhmm... all of that stuff belongs to the copyright of the people at hompy.com. I wish they would make an english site, but anyway, major props to them for a rawkin' kewl site.