Jelly moulds
Becoming rarer in charity shops one or two glass jelly moulds look well on your kitchen shelf.
If collecting jelly moulds then the larger oval ones are common, look for the rarest, the small blancmange/jelly dishes in an oval shape, as in the front of the picture. I did have an even smaller one that was only a couple of inches long once, maybe it will turn up in the house move.
The oldest vintage moulds are likely to be on the left of the rabbits...
I did come across a recipe for chopped ham and peas in a lemon jelly, but have yet to make it...