You can grab Bryce 6 for $6 (plus DAZ subscription fee for about $29.99) but it still works out well as the software is worth $99, new.
http://www.daz3d.com/program/bryce/index.php?refid=659259754&b=7
I know I already posted in the geek forums reguarding this, but someone pointed out that should have posted here, being a 3D software subject. Anywho, here's a rendering I produced with it. I'm still new to the software though so it's not that great.
I lay upon my bed one bright clear night, and gazed upon the distant stars far above, then I thought... where the hell is my roof?