Yeah I checked out those pics on your site, look really cool.
I got the free download of Bryce 5 a while back (think you posted the link up!) not used it to be honest, ive also got world builder that was free on a 3d world mag, again not used it! I really need to concentrate on other things before moving onto an environment app! Will have a look though when I get some time for fun stuff.
Oh Modo's pretty cool BTW, very custamizable to your workflow and you can get it set up nicely if your used to the controls in maya, the paintings really good (like Z brush, which I thought it would be), well worth getting the free trial and the free videos to get you up and going, a bit of a pain without a tablet (same with Z brush).
Shame my trials run out!
"No pressure, no diamonds" Thomas Carlyle