If you build your own VRML worlds and don't
have a lot of money, you've probably already heard about Spazz3D,
the VRML modeler. They've got a gallery of samples from their users
at http://www.spazz3d.com/samples.html
that has some outstanding creations.
Some of these worlds use the blaxxun extensions (e.g., NURBS)
that aren't supported by other browsers yet.
Since Spazz3D is an animation tool as well as a modeling tool,
look for some outstanding examples of animation, including Addy's
dancers (pictured) which blew me away. -B.C.