Hi there!
I drew out templates of the shapes I wanted and then prepared my sugarpaste. I applied a different effect to each layer, so the bottom layer was grey sugarpaste coated in silver luster dust, the middle layer I rolled out on an impression mat and coated in pearl luster dust, and the front layer I coated in edible holographic glitter.
Using the templates I cut round the shapes. I then glued each of the layers together and placed them on a folded piece of card which I had taped to the angle I wanted (using this to form the shape). I left them to dry out over night and then fixed them to the cake with royal icing.
I hope this makes sense, I always find it hard to explain processes that I do by instinct! :)