Bern, one way would be to create your basic prop shape, then apply a twist deformer to it. Another would be to simply grab cvs or hull (assuming you're creating the shape using NURBS/curves) and rotating them. Try this and see if it works for you:

1. Draw the tear drop prop shape using the CV tool (Draw one half and mirror if you like) in the top view. Make sure the curve is closed.

2. Create a planar surface from the curve.

3. Now select a couple of hulls or a batch of CVs and rotate.

Like everything else, there are many different ways to achieve the same thing....some work better than others.