I'm gathering up some of the mince pie trays, sweet and biscuit trays that come from the selection boxes to use as moulds for plaster work.
Not sure exactly what I'm going to get from them yet, but I'll be experimenting in the new year.
This one has potential. Certainly the shield shaped tray.
I tried this a few years back when I modelled some stone pillars from an old chocolate selection tray.