Available for download. Some are over 100 megs but sweetness. Have to login to the forums but some nice stuff.. http://conceptart.org/forums/forumdisplay.php?f=88
It really depends on how much control you get to exert over the thing you create. With characters you pretty much have control of the whole process (minus animation). You can point to the whole thing and say "I made that!" With environments it can easily end up like factory work where you make one tiny piece that gets…