So I saw 'dawns dress diary' post about shrink plastic jewellry. And I just had to have a go. They were selling small packs of shrinkles sheets for pocket money prices so...I bought myself a pack of the frosted style and some broach backs.
Above was its original size about 15 cm tall. Then I popped it in the oven along with two other ones.
I superglued the broach pins on the back
Quite pleased with the results. Much lighter than using polymer clay.
Here you can see it pinned onto my femme 6th doctor cosplay.