Well I think the only answer and the best solution is to get a program where it can easily make you 3d Design. This is why a useful software like Google Sketchup is a must in your collection of tools and like Google Earth the software is free.
Google SketchUp is software that you can use to create, modify and share 3D models. It’s easier to learn than other 3D modeling programs, which is why so many people are already using it. We designed SketchUp’s simplified toolset, guided drawing system and clean look-and-feel to help you concentrate on two things: getting your work done as efficiently as possible, and having fun while you’re doing it.
The only problem I have seen in this is getting the required plug-ins. Since if you have to get some plugins you have to download it from their site. If only the download includes some standard plug-in like chair, Tables, etc.. for the buildings it would be very easy to make my House Floor Plan. 🙂 . But still this is good. The downloaded file is about 32 MB. And therefore if you have a DSL Connection it will not be a problem for you.
So why don’t you try it and let us know your comments. We may also share some Plug-ins to ease the downloading time.
Hope you like it. Really Google is # 1.