Not exactly the design I started out to make. However, the puzzle piece took so long, I will have to eventually make the other design to justify the time I spent trying to get the top rounded just right.
This is a combination of two images. Terragen can't yet add the smoke and debris, so I did that part in Bryce. Which came out so well, it made me want to redo the Terragen part, but I had to stop playing somewhere.