Wayne,
Need a little more info. You say "sweep a solid", do you mean sweep a cross-section into a solid because Creo/Pro doesn't have a drag solid capability except for creating tessellated envelopes, which won't create smooth geometry.
As for a spoon shape, Var traj sweeps can do a lot, but the best way is to revolve an ellipse into a paraboloid (egg shape) and then cut away a portion.
If this isn't what you want, post a sketch of what you're looking for and I'm sure someone will give it a try.
Cheers,
Kevin
WAYNE FALCO, I don't see Antonius in this thread. 
An option using a boundary blend would be as follows (I don't have WF4 installed anymore, or I'd post a model for you):
- Sketch an ellipse
- Create a datum plane offset from the ellipse sketch the height that you'd like the "spoon" shape to be.
- Create a datum point on that plane at the center of the ellipse.
- Create a boundary blend using the sketched ellipse and the point as the two curves.
- Create a tangency condition at the datum point to the offset plane.
This should create a nice domed surface which you can use to build your solid.
