So, I wanted to add substance to my craft. This was quite easy. I rearranged the points in the VertexBuffer into a list describing a triangle fan and fiddled to get that to work.

pointList_VB = new VertexBuffer(typeof(CustomVertex.PositionColored),
12, device,
Usage.Dynamic | Usage.WriteOnly,

CustomVertex.PositionColored[] verts = new CustomVertex.PositionColored[12];

// Triangle #1

verts[0].Position = new Vector3(0.0f, 0.5f, 0.0f);
verts[0].Color = Color.Blue.ToArgb();

verts[1].Position = new Vector3(0.5f, -0.2f, 0.0f);
verts[1].Color = Color.Green.ToArgb();

verts[2].Position = new Vector3(0.0f, 0.0f, 0.2f);
verts[2].Color = Color.Orange.ToArgb();

verts[3].Position = new Vector3(-0.5f, -0.2f, 0.0f);
verts[3].Color = Color.Red.ToArgb();

verts[4].Position = new Vector3(0.0f, 0.0f, -0.2f);
verts[4].Color = Color.Yellow.ToArgb();

verts[5].Position = new Vector3(0.5f, -0.2f, 0.0f);
verts[5].Color = Color.Green.ToArgb();

Yawn. Then I appended some points to that list for a triangle list to close off the object.

verts[6].Position = new Vector3(-0.5f, -0.2f, 0.0f);
verts[6].Color = Color.Red.ToArgb();

verts[7].Position = new Vector3(0.5f, -0.2f, 0.0f);
verts[7].Color = Color.Green.ToArgb();

verts[8].Position = new Vector3(0.0f, 0.0f, -0.2f);
verts[8].Color = Color.Yellow.ToArgb();

verts[9].Position = new Vector3(-0.5f, -0.2f, 0.0f);
verts[9].Color = Color.Red.ToArgb();

verts[10].Position = new Vector3(0.5f, -0.2f, 0.0f);
verts[10].Color = Color.Green.ToArgb();

verts[11].Position = new Vector3(0.0f, 0.0f, 0.2f);
verts[11].Color = Color.Orange.ToArgb();

pointList_VB.SetData(verts, 0, LockFlags.None);

And then drawing it with indexed calls to my VB stream as follows.

d3dDevice.SetStreamSource(0, pointList_VB, 0);
d3dDevice.DrawPrimitives(PrimitiveType.PointList, 0, 7);
d3dDevice.Transform.World = Matrix.Multiply(
Matrix.RotationYawPitchRoll(Geometry.DegreeToRadian(p1.Rotation.X), Geometry.DegreeToRadian(p1.Rotation.Y), Geometry.DegreeToRadian(p1.Rotation.Z)),
Matrix.Translation(p1.Position.X, p1.Position.Y, 20.0f)
d3dDevice.DrawPrimitives(PrimitiveType.TriangleFan, 0, 5);
d3dDevice.DrawPrimitives(PrimitiveType.TriangleList, 6, 11);

Drawing it revealed to me that I'd got up & down confused on the y-rotation.. so after fixing that it was all solid.

And it looks something like this. (from a few viewpoints)

Really has to be seen in motion for full effect.