This really has come about because I've been experimenting with Rob A's RMA path blend script. I like trying to create 3dish shapes in gimp but trying to curve gradients to create the shadows and texture can be a nightmare, then I came across the above script and it was ideal for what I was trying to achieve.
Finally I used Grechan's new Plastic or Glass script just to boost the highlights of the goblet, you'll find the script here.

that definitely looks metallic!

Nice job, he4rty.

The result is amazing. I love it!
I maybe just apply the blur (selective) tool in some hard edges.

he4rty: that's very cever, i don't think i would ever have thought of using the script like that. i've ony been trying (and failing) to make credible ribbons with it. i think the upper part of the goblet looks lovely, it looks like a silver goblet that's been around for a few years. but the stem (or whatever it's called!) doesn't really fit in, it has a very modern, straight lined and brushed steel-y look about it that doesn't go perfectly with the upper part.

Thanks for the Comments.

Anmal - The stems been bugging me as well, first I think its to thick maybe need to slim it down a bit and second also wondering whether to give it some shape, also I don't like the base colouring much either.

I can see some google research coming.