Not sure if this has been posted before (did a quick search, nothing found) but I found this invaluable for creating scenes:
sweethome3d.com/
…it’s free and it will export to Obj. So if you use obj2egg ([treeform's obj2egg <bug hunt>)) you’re away in Panda land. 
Cheers,
Gary
Looking good layout of 3d design if you have more space you can make use of the software more fascinating as it can do a lot more in designing a house.
If you mean the software then he did link the place you could download it sweethome3d.com/download.jsp
